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2019 Nitto ATP Finals Day 8

Dominic Thiem is aiming to lift his sixth title of 2019 at the Nitto ATP Finals on Sunday.

Dominic Thiem is contesting his 25th tour-level championship match (16-8) at the Nitto ATP Finals on Sunday. © Peter Staples/ATP Tour

Stefanos Tsitsipas is bidding to lift his third trophy of 2019 at the Nitto ATP Finals on Sunday.

Stefanos Tsitsipas is bidding to become the youngest Nitto ATP Finals champion since Lleyton Hewitt in 2001. © Peter Staples/ATP Tour

Stefanos Tsitsipas is making his debut at the Nitto ATP Finals this week.

Stefanos Tsitsipas owns a 53-25 record this season. © Peter Staples/ATP Tour

Stefanos Tsitsipas won three of four matches to reach the Nitto ATP Finals championship match.

Stefanos Tsitsipas is aiming to become the first Greek champion at the Nitto ATP Finals. © Peter Staples/ATP Tour

Dominic Thiem won three of four matches to reach the Nitto ATP Finals championship match.

Dominic Thiem is aiming to record his 50th victory of 2019 at the Nitto ATP Finals on Sunday. © Peter Staples/ATP Tour

Stefanos Tsitsipas becomes the youngest Nitto ATP Finals champion since Lleyton Hewitt in 2001.

Stefanos Tsitsipas is the sixth youngest champion in Nitto ATP Finals history. © Peter Staples/ATP Tour

Stefanos Tsitsipas ends 2019 with a 54-25 record.

Stefanos Tsitsipas finishes his 2019 ATP Tour season with three titles. © AFP/Getty Images

Stefanos Tsitsipas is the first player to win the Next Gen ATP Finals and the Nitto ATP Finals.

Stefanos Tsitsipas collects 1,300 ATP Rankings points for his Nitto ATP Finals triumph. © Julian Finney/Getty Images

Stefanos Tsitsipas is the fourth player in as many years to lift the Nitto ATP Finals trophy for the first time.

Stefanos Tsitsipas is the first player to win the Nitto ATP Finals in a final-set tie-break since David Nalbandian in 2005. © AFP/Getty Images

Stefanos Tsitsipas will finish 2019 as No. 6 in the ATP Rankings.

Stefanos Tsitsipas celebrates with his team after lifting the Nitto ATP Finals trophy. © Peter Staples/ATP Tour

Stefanos Tsitsipas collects $2,656,000 in prize money for winning the Nitto ATP Finals.

Stefanos Tsitsipas ends his 2019 season with a 3-3 record in championship matches. © Peter Staples/ATP Tour

Stefanos Tsitsipas shares a moment with coaches Apostolos Tsitsipas and Patrick Mouratoglou after winning the Nitto ATP Finals on Sunday.

Stefanos Tsitsipas, Apostolos Tsitsipas and Patrick Mouratoglou celebrate after the Nitto ATP Finals championship match on Sunday. © Peter Staples/ATP Tour

Stefanos Tsitsipas claims his third victory in seven FedEx ATP Head2Head clashes against Dominic Thiem at the Nitto ATP Finals on Sunday.

Stefanos Tsitsipas is the only Greek player to compete at the Nitto ATP Finals since the tournament began in 1970. © Julian Finney/Getty Images

Dominic Thiem finishes 2019 at No. 4 in the ATP Rankings.

Dominic Thiem ends 2019 with five titles and a 49-19 record. © Peter Staples/ATP Tour

Pierre-Hugues Herbert and Nicolas Mahut are the seventh seeds at the Nitto ATP Finals.

Pierre-Hugues Herbert and Nicolas Mahut are competing at the Nitto ATP Finals for the fifth straight year. © AFP/Getty Images

Nicolas Mahut and Pierre-Hugues Herbert improve to 19-5 as a team this year.

Nicolas Mahut and Pierre-Hugues Herbert extend their winning streak to nine matches after winning the Nitto ATP Finals championship match on Sunday. © Peter Staples/ATP Tour

Nicolas Mahut and Pierre-Hugues Herbert have won all 18 sets they have played since arriving at the Rolex Paris Masters last month.

Nicolas Mahut and Pierre-Hugues Herbert are the first team to win the Nitto ATP Finals title without dropping a set since 2015. © Peter Staples/ATP Tour

Raven Klaasen and Michael Venus were aiming to capture their third title of 2019.

Raven Klaasen and Michael Venus end their season with a 35-19 record. © Peter Staples/ATP Tour

Pierre-Hugues Herbert and Nicolas Mahut claim their third team title of 2019.

Pierre-Hugues Herbert and Nicolas Mahut are the first French team to lift the Nitto ATP Finals trophy since 2005. © Peter Staples/ATP Tour

Pierre-Hugues Herbert/Nicolas Mahut and Michael Venus/Raven Klaasen both won their round-robin groups at this year's Nitto ATP Finals.

Pierre-Hugues Herbert and Nicolas Mahut share a moment with Michael Venus and Raven Klaasen following the Nitto ATP Finals doubles trophy ceremony. © Peter Staples/ATP Tour

2019 Nitto ATP Finals Day 7

Alexander Zverev and Dominic Thiem pose for a picture before their Nitto ATP Finals last-four clash on Saturday.

Alexander Zverev and Dominic Thiem have contested eight FedEx ATP Head2Head encounters, with Thiem leading 6-2. © Julian Finney/Getty Images

Dominic Thiem advances to his 25th tour-level final (16-8) at the Nitto ATP Finals on Saturday.

Dominic Thiem owns a 5-1 record in finals this year. © Peter Staples/ATP Tour

Alexander Zverev was aiming to become the first man since Novak Djokovic in 2015 to win back-to-back trophies at the Nitto ATP Finals.

Alexander Zverev ends his 2019 season with one title and a 44-25 record. © Peter Staples/ATP Tour

Dominic Thiem will meet Stefanos Tsitsipas for the Nitto ATP Finals trophy.

Nicolas Mahut and Pierre-Hugues Herbert will face Raven Klaasen and Michael Venus in the Nitto ATP Finals championship match on Sunday.

Nicolas Mahut and Pierre-Hugues Herbert are aiming to become the first French team since 2005 to lift the Nitto ATP Finals trophy. © AFP/Getty Images

Marcelo Melo and Lukasz Kubot finish their 2019 ATP Tour season with six final appearances.

Marcelo Melo and Lukasz Kubot end 2019 with a 46-22 team record. © Julian Finney/Getty Images

Nicolas Mahut and Pierre-Hugues Herbert are on an eight-match winning streak.

Nicolas Mahut and Pierre-Hugues Herbert own a 2-0 team record in finals this year. © AFP/Getty Images

The Nitto ATP Finals hosts a ceremony to thank recently retired players for their service to the ATP Tour.

The Nitto ATP Finals hosts an on-court presentation to thank players for their many years of service on the ATP Tour. © Justin Setterfield/Getty Images

Stefanos Tsitsipas owns a 53-26 record this season.

Stefanos Tsitsipas is the first Greek to qualify for the Nitto ATP Finals. © Justin Setterfield/Getty Images

Stefanos Tsitsipas is making his debut at the Nitto ATP Finals this year.

Stefanos Tsitsipas will face Dominic Thiem or Alexander Zverev for the Nitto ATP Finals title on Sunday. © Peter Staples/ATP Tour

Roger Federer finishes his 2019 season with four titles.

Roger Federer reached six finals (4-2) and compiled a 53-10 record in 2019. © Peter Staples/ATP Tour

Stefanos Tsitsipas improves to 3-1 at the Nitto ATP Finals this week.

Stefanos Tsitsipas saves 11 of 12 break points to beat Roger Federer in straight sets at the Nitto ATP Finals on Saturday. © Peter Staples/ATP Tour

Stefanos Tsitsipas levels his FedEx ATP Head2Head record against Roger Federer at 2-2.

Stefanos Tsitsipas is through to his sixth final of the year (2-3). © Peter Staples/ATP Tour

Raven Klaasen and Michael Venus level their FedEx ATP Head2Head record against Juan Sebastian Cabal and Robert Farah at 3-3.

Raven Klaasen and Michael Venus reach their first Nitto ATP Finals championship match on Saturday. © AFP/Getty Images

Juan Sebastian Cabal and Robert Farah exit the Nitto ATP Finals at the semi-final stage for the second straight year.

Juan Sebastian Cabal and Robert Farah end their 2019 season with five team titles and a 50-19 record. © AFP/Getty Images

2019 Nitto ATP Finals Day 6

Rafael Nadal ends Group Andre Agassi with a 2-1 record.

Rafael Nadal celebrates with ball kids at the Nitto ATP Finals after collecting the 2019 ATP Tour year-end No. 1 trophy. © Peter Staples/ATP Tour

Alexander Zverev is into the last four at the Nitto ATP Finals for the second straight year.

Alexander Zverev improves to 7-4 at the Nitto ATP Finals. © Peter Staples/ATP Tour

Daniil Medvedev is the first Russian to compete at the Nitto ATP Finals since Nikolay Davydenko lifted the trophy in 2009.

Daniil Medvedev finishes his 2019 season with a 59-21 record. © Peter Staples/ATP Tour

Alexander Zverev is aiming to become the first player to win back-to-back Nitto ATP Finals crowns since Novak Djokovic in 2015.

Alexander Zverev will meet Dominic Thiem for a spot in the Nitto ATP Finals championship match. © Peter Staples/ATP Tour

Nicolas Mahut and Pierre-Hugues Herbert are on a seven-match winning streak.

Nicolas Mahut and Pierre-Hugues Herbert finish Group Max Mirnyi with a 3-0 record. © AFP/Getty Images

Pierre-Hugues Herbert and Nicolas Mahut are the only team to win all three round-robin matches at this year's Nitto ATP Finals.

Pierre-Hugues Herbert and Nicolas Mahut have not dropped a set since arriving at the Rolex Paris Masters last month. © Julian Finney/Getty Images

Jean-Julien Rojer and Horia Tecau lifted the Nitto ATP Finals title in 2015.

Jean-Julien Rojer and Horia Tecau end their year with a 31-23 team record. © AFP/Getty Images

Rafael Nadal broke serve on two occasions to beat Stefanos Tsitsipas in three sets at the Nitto ATP Finals on Friday.

Rafael Nadal improves to 5-1 in his FedEx ATP Head2Head series against Stefanos Tsitsipas. © Peter Staples/ATP Tour

Rafael Nadal improves to 18-14 at the Nitto ATP Finals.

Rafael Nadal owns a 53-7 record this season. © Peter Staples/ATP Tour

Rafael Nadal finishes Group Andre Agassi with a 2-1 record.

Rafael Nadal recovers from a set down to beat Stefanos Tsitsipas in three sets at the Nitto ATP Finals on Friday. © Peter Staples/ATP Tour

Stefanos Tsitsipas is competing at the Nitto ATP Finals for the first time.

Stefanos Tsitsipas will face Roger Federer for a place in the Nitto ATP Finals championship match. © Peter Staples/ATP Tour

Rafael Nadal claims the ATP Tour year-end No. 1 trophy for the fifth time.

Rafael Nadal joins Roger Federer, Novak Djokovic and Jimmy Connors with five ATP Tour year-end No. 1 finishes. © AFP/Getty Images

Juan Sebastian Cabal and Robert Farah end Group Max Mirnyi with a 1-2 record.

Juan Sebastian Cabal and Robert Farah are aiming to lift their sixth trophy of the season this week. © Justin Setterfield/Getty Images

Andreas Mies and Kevin Krawietz end their 2019 season with a 29-20 tour-level team record.

Andreas Mies and Kevin Krawietz finish their debut appearance at the Nitto ATP Finals with a 1-2 record. © Justin Setterfield/Getty Images

Juan Sebastian Cabal and Robert Farah beat Kevin Krawietz and Andreas Mies in straight sets at the Nitto ATP Finals on Friday.

Juan Sebastian Cabal and Robert Farah will meet Raven Klaasen and Michael Venus in the last four at the Nitto ATP Finals. © AFP/Getty Images

Rafael Nadal celebrates with the ATP Tour year-end No. 1 trophy at the Nitto ATP Finals on Friday.

Rafael Nadal receives the ATP Tour year-end No. 1 trophy on court after beating Stefanos Tsitsipas at the Nitto ATP Finals on Friday. © AFP/Getty Images

ATP Executive Chairman and President Chris Kermode and Rafael Nadal pose for a photo at the Nitto ATP Finals on Friday.

ATP Executive Chairman and President Chris Kermode presents Rafael Nadal with the ATP Tour year-end No. 1 trophy. © Julian Finney/Getty Images

2019 Nitto ATP Finals Day 5

Roger Federer levels his Nitto ATP Finals record against Novak Djokovic at 3-3.

Roger Federer breaks Novak Djokovic on three occasions to reach the final four at the Nitto ATP Finals on Thursday. © Peter Staples/ATPTour

Roger Federer has reached the semi-finals of the Nitto ATP Finals in 16 of his 17 appearances

Roger Federer has reached the semi-finals of the Nitto ATP Finals in 16 of his 17 appearances © Peter Staples/ATP Tour

Novak Djokovic is eliminated from Group Bjorn Borg at the Nitto ATP Finals.

Novak Djokovic is eliminated from Group Bjorn Borg at the Nitto ATP Finals. © Peter Staples/ATP Tour

Filip Polasek and Ivan Dodig end Group Jonas Bjorkman with a 1-2 record.

Filip Polasek and Ivan Dodig improve to 3-0 in their FedEx ATP Head2Head series against Raven Klaasen and Michael Venus. © James Chance/Getty Images

Filip Polasek and Ivan Dodig break serve on two occasions to beat Raven Klaasen and Michael Venus at the Nitto ATP Finals on Sunday.

Filip Polasek and Ivan Dodig end their 2019 season with a 27-11 team record. © Peter Staples/ATP Tour

Matteo Berrettini becomes the first Italian to win a singles match at the Nitto ATP Finals.

Matteo Berrettini becomes the first Italian to win a singles match at the Nitto ATP Finals. © Peter Staples/ATP Tour

Matteo Berrettini scores his maiden win at the Nitto ATP Finals.

Matteo Berrettini scores his maiden win at the Nitto ATP Finals. © Peter Staples/ATP Tour

Dominic Thiem finishes with a 2-1 record in Group Bjorn Borg at the Nitto ATP Finals.

Dominic Thiem finishes with a 2-1 record in Group Bjorn Borg at the Nitto ATP Finals. © Peter Staples/ATP Tour

Lukasz Kubot and Marcelo Melo advance to the semi-finals at the Nitto ATP Finals.

Lukasz Kubot and Marcelo Melo advance to the semi-finals at the Nitto ATP Finals. © Peter Staples/ATP Tour

Lukasz Kubot and Marcelo Melo defeat Rajeev Ram and Joe Salisbury at the Nitto ATP Finals.

Lukasz Kubot and Marcelo Melo defeat Rajeev Ram and Joe Salisbury at the Nitto ATP Finals. © Peter Staples/ATP Tour

Rajeev Ram and Joe Salisbury were unable to advance out of Group Jonas Bjorkman at the Nitto ATP Finals.

Rajeev Ram and Joe Salisbury were unable to advance out of Group Jonas Bjorkman at the Nitto ATP Finals. © Peter Staples/ATP Tour

Roger Federer is competing at the Nitto ATP Finals for the 17th time.

Roger Federer owns a 59-16 record at the Nitto ATP Finals. © Peter Staples/ATP Tour

Novak Djokovic, Katarina Johnson-Thompson and Roger Federer pose for a photo at the Nitto ATP Finals on Thursday.

Novak Djokovic, heptathlon world champion Katarina Johnson-Thompson and Roger Federer meet at the Nitto ATP Finals on Thursday. © Peter Staples/ATP Tour

2019 Nitto ATP Finals Day 4

Stefanos Tsitsipas defeats Alexander Zverev and reaches the semi-finals at the Nitto ATP Finals.

Stefanos Tsitsipas defeats Alexander Zverev and reaches the semi-finals at the Nitto ATP Finals. © Peter Staples/ATP Tour

Stefanos Tsitsipas has yet to drop a set in his debut at The O2.

Stefanos Tsitsipas has yet to drop a set in his debut at The O2. © Peter Staples/ATP Tour

Alexander Zverev is still in contention to advance out of Group Andre Agassi.

Alexander Zverev is still in contention to advance out of Group Andre Agassi. © Justin Setterfield/Getty Images

Pierre-Hugues Herbert and Nicolas Mahut extend their winning streak to six matches.

Pierre-Hugues Herbert and Nicolas Mahut reach the last four at the Nitto ATP Finals for the second straight year. © Julian Finney/Getty Images

Pierre-Hugues Herbert and Nicolas Mahut finished runner-up at the 2018 Nitto ATP Finals.

Pierre-Hugues Herbert and Nicolas Mahut finished runner-up at the 2018 Nitto ATP Finals. © Peter Staples/ATP Tour

Kevin Krawietz and Andreas Mies drop to 1-1 in Group Max Mirnyi.

Kevin Krawietz and Andreas Mies drop to 1-1 in Group Max Mirnyi. © Peter Staples/ATP Tour

Nicolas Mahut and Pierre-Hugues Herbert are appearing at the Nitto ATP Finals together for the fifth straight year.

Nicolas Mahut and Pierre-Hugues Herbert own a 16-5 record as a team this year. © Peter Staples/ATP Tour

Rafael Nadal signs autographs after defeating Daniil Medvedev at the Nitto ATP Finals.

Rafael Nadal signs autographs after defeating Daniil Medvedev at the Nitto ATP Finals. © Peter Staples/ATP Tour

Rafael Nadal is 3-0 lifetime in final-set tie-breaks at the Nitto ATP Finals.

Rafael Nadal is 3-0 lifetime in final-set tie-breaks at the Nitto ATP Finals. © Peter Staples/ATP Tour

Daniil Medvedev let slip a match point in his loss to Rafael Nadal at the Nitto ATP Finals.

Daniil Medvedev let slip a match point in his loss to Rafael Nadal at the Nitto ATP Finals. © Peter Staples/ATP Tour

Rafael Nadal picks up his first win of the week against Daniil Medvedev at the Nitto ATP Finals.

Rafael Nadal picks up his first win of the week against Daniil Medvedev at the Nitto ATP Finals. © Peter Staples/ATP Tour

Jean-Julien Rojer and Horia Tecau defeat Juan Sebastian Cabal and Robert Farah at the Nitto ATP Finals.

Jean-Julien Rojer and Horia Tecau defeat Juan Sebastian Cabal and Robert Farah at the Nitto ATP Finals. © Justin Setterfield/Getty Images

Jean-Julien Rojer and Horia Tecau prevailed at the Nitto ATP Finals in 2015.

Jean-Julien Rojer and Horia Tecau prevailed at the Nitto ATP Finals in 2015. © Peter Staples/ATP Tour

Robert Farah and Juan Sebastian Cabal drop to 0-2 in Group Max Mirnyi.

Robert Farah and Juan Sebastian Cabal drop to 0-2 in Group Max Mirnyi. © Peter Staples/ATP Tour

2019 Nitto ATP Finals Day 3

Dominic Thiem scores an epic third-set tie-break win against Novak Djokovic to reach the semi-finals.

Dominic Thiem scores an epic third-set tie-break win against Novak Djokovic to reach the semi-finals. © Peter Staples/ATP Tour

Dominic Thiem has won four of his past five FedEx ATP Head2Head meetings against Novak Djokovic.

Dominic Thiem has won four of his past five FedEx ATP Head2Head meetings against Novak Djokovic. © Peter Staples/ATP Tour

Novak Djokovic must win his final round-robin match against Roger Federer in order to advance out of Group Bjorn Borg.

Novak Djokovic must win his final round-robin match against Roger Federer in order to advance out of Group Bjorn Borg. © Peter Staples/ATP Tour

Michael Venus and Raven Klaasen are the first team to reach the semi-finals at the Nitto ATP Finals.

Michael Venus and Raven Klaasen are the first team to reach the semi-finals at the Nitto ATP Finals. © Peter Staples/ATP Tour

Raven Klaasen has been showing off his athleticism at the Nitto ATP Finals.

Raven Klaasen has been showing off his athleticism at the Nitto ATP Finals. © Peter Staples/ATP Tour

Marcelo Melo/Lukasz Kubot must now win their final round-robin match against Rajeev Ram/Joe Salisbury to reach the semi-finals.

Marcelo Melo/Lukasz Kubot must now win their final round-robin match against Rajeev Ram/Joe Salisbury to reach the semi-finals. © Peter Staples/ATP Tour

Roger Federer moves to 17-0 lifetime in his second round-robin match at the Nitto ATP Finals.

Roger Federer moves to 17-0 lifetime in his second round-robin match at the Nitto ATP Finals. © Peter Staples/ATP Tour

Roger Federer improves to 2-0 in his FedEx ATP Head2Head rivalry with Matteo Berrettini.

Roger Federer improves to 2-0 in his FedEx ATP Head2Head rivalry with Matteo Berrettini. © Peter Staples/ATP Tour

Matteo Berrettini is still looking to become the first Italian to win a match at the Nitto ATP Finals.

Matteo Berrettini is still looking to become the first Italian to win a match at the Nitto ATP Finals. © Peter Staples/ATP Tour

Rajeev Ram and Joe Salisbury outlast Ivan Dodig and Filip Polasek at the Nitto ATP Finals.

Rajeev Ram and Joe Salisbury outlast Ivan Dodig and Filip Polasek at the Nitto ATP Finals. © Peter Staples/ATP Tour

Joe Salisbury and Rajeev Ram are still in contention to advance out of round-robin action at the Nitto ATP Finals.

Joe Salisbury and Rajeev Ram are still in contention to advance out of round-robin action at the Nitto ATP Finals. © Peter Staples/ATP Tour

Filip Polasek and Ivan Dodig drop to 0-2 in Group Jonas Bjorkman at the Nitto ATP Finals.

Filip Polasek and Ivan Dodig drop to 0-2 in Group Jonas Bjorkman at the Nitto ATP Finals. © Peter Staples/ATP Tour

2019 Nitto ATP Finals Day 2

Alexander Zverev opens his Nitto ATP Finals title defence with a win over Rafael Nadal.

Alexander Zverev opens his Nitto ATP Finals title defence with a win over Rafael Nadal. © Julian Finney/Getty Images

Alexander Zverev improves to 3-0 in opening matches at the Nitto ATP Finals

Alexander Zverev improves to 3-0 in opening matches at the Nitto ATP Finals. © Adrian Dennis/AFP via Getty Images

Rafael Nadal suffered his first-ever loss to Alexander Zverev at the Nitto ATP Finals.

Rafael Nadal suffered his first-ever loss to Alexander Zverev at the Nitto ATP Finals. © Justin Setterfield/Getty Images

Nicolas Mahut/Pierre-Hugues Herbert upset top seeds Juan Sebastian Cabal/Robert Farah at the Nitto ATP Finals.

Nicolas Mahut/Pierre-Hugues Herbert upset top seeds Juan Sebastian Cabal/Robert Farah at the Nitto ATP Finals. © Peter Staples/ATP Tour

Nicolas Mahut gets plenty of hang time at the Nitto ATP Finals.

Nicolas Mahut gets plenty of hang time at the Nitto ATP Finals. © Peter Staples/ATP Tour

Robert Farah and Juan Sebastian Cabal drop their first match in Group Max Mirnyi at the Nitto ATP Finals.

Robert Farah and Juan Sebastian Cabal drop their first match in Group Max Mirnyi at the Nitto ATP Finals. © Peter Staples/ATP Tour

Stefanos Tsitsipas secured his first win in six tries against Daniil Medvedev at the Nitto ATP Finals.

Stefanos Tsitsipas secured his first win in six tries against Daniil Medvedev at the Nitto ATP Finals. © Peter Staples/ATP Tour

Stefanos Tsitsipas didn't give Daniil Medvedev a break point at the Nitto ATP Finals.

Stefanos Tsitsipas didn't give Daniil Medvedev a break point in their clash at the Nitto ATP Finals. © Peter Staples/ATP Tour

Daniil Medvedev fell to Stefanos Tsitsipas in his opening match at the Nitto ATP Finals.

Daniil Medvedev fell to Stefanos Tsitsipas in his opening match at the Nitto ATP Finals. © Peter Staples/ATP Tour

Andreas Mies and Kevin Krawietz pick up their maiden win at the Nitto ATP Finals.

Andreas Mies and Kevin Krawietz pick up their maiden win at the Nitto ATP Finals. © Peter Staples/ATP Tour

Kevin Krawietz used all of his athleticism during his Nitto ATP Finals debut.

Kevin Krawietz used all of his athleticism during his Nitto ATP Finals debut. © Peter Staples/ATP Tour

Jean-Julien Rojer/Horia Tecau drop their opening match at the Nitto ATP Finals to Kevin Krawietz/Andreas Mies

Jean-Julien Rojer/Horia Tecau drop their opening match at the Nitto ATP Finals to Kevin Krawietz/Andreas Mies © Peter Staples/ATP Tour

2019 Nitto ATP Finals Day 1

Dominic Thiem makes time to sign autographs after defeating Roger Federer at the Nitto ATP Finals.

Dominic Thiem makes time to sign autographs after defeating Roger Federer at the Nitto ATP Finals. © Peter Staples/ATP Tour

Dominic Thiem scores his third consecutive victory this year against Roger Federer.

Dominic Thiem scores his third consecutive victory this year against Roger Federer. © Adrian Dennis/AFP via Getty Images

Roger Federer drops to 12-5 in opening matches at the Nitto ATP Finals after his loss to Dominic Thiem.

Roger Federer drops to 12-5 in opening matches at the Nitto ATP Finals after his loss to Dominic Thiem. © Peter Staples/ATP Tour

Marcelo Melo and Lukasz Kubot defeat Ivan Dodig and Filip Polasek at the Nitto ATP Finals on Sunday.

Marcelo Melo and Lukasz Kubot level their FedEx ATP Head2Head series against Ivan Dodig and Filip Polasek at 2-2. © Peter Staples/ATP Tour

Marcelo Melo and Lukasz Kubot celebrate their victory against Ivan Dodig and Filip Polasek at the Nitto ATP Finals on Sunday.

Marcelo Melo and Lukasz Kubot own a 45-20 record as a team this year. © Peter Staples/ATP Tour

Ivan Dodig and Filip Polasek began their partnership at the Turkish Airlines Open Antalya In June.

Ivan Dodig and Filip Polasek have lifted trophies in Cincinnati and Beijing this year. © Julian Finney/Getty Images

Novak Djokovic owns five Nitto ATP Finals titles.

Novak Djokovic improves to 36-12 at the Nitto ATP Finals. © Justin Setterfield/Getty Images

Novak Djokovic is aiming to lift his first Nitto ATP Finals title since 2015.

Novak Djokovic is chasing a sixth year-end No. 1 finish in the ATP Rankings. © Julian Finney/Getty Images

Novak Djokovic is seeking his sixth tour-level trophy of the season this week.

Novak Djokovic records his 54th victory of the year at the Nitto ATP Finals on Sunday. © AFP/Getty Images

Matteo Berrettini has lifted two ATP Tour crowns this year.

Matteo Berrettini is making his debut at the Nitto ATP Finals this week. © Justin Setterfield/Getty Images

Raven Klaasen and Michael Venus are the fifth seeds at this year's Nitto ATP Finals.

Raven Klaasen and Michael Venus have lifted two ATP 500 titles this year. © Justin Setterfield/Getty Images

Michael Venus and Raven Klaasen own a 33-17 team record this year.

Michael Venus and Raven Klaasen save all four break points they face to defeat Rajeev Ram and Joe Salisbury at the Nitto ATP Finals on Sunday. © Justin Setterfield/Getty Images

Joe Salisbury and Rajeev Ram drop to 38-23 as a team this year.

Joe Salisbury and Rajeev Ram are making their team debut at the Nitto ATP Finals this year. © Justin Setterfield/Getty Images

2018 Nitto ATP Finals Day 8

01 Beckhams Nitto ATP Finals 2018 Sunday

Beckham, Beckham

Romeo Beckham and David Beckham attend finals day of the Nitto ATP Finals at The O2 on Sunday. © Julian Finney/Getty Images

Bryan, Sock

Mike Bryan and Jack Sock battle hard on Sunday to work their way back into the doubles final at the Nitto ATP Finals. © Clive Brunskill/Getty Images

Djokovic

Novak Djokovic lifted four tour-level trophies this season. © Julian Finney/Getty Images

Djokovic

Novak Djokovic ends his 2018 ATP World Tour season with a 53-12 tour-level record. © Justin Setterfield/Getty Images

Djokovic, Zverev

Novak Djokovic and Alexander Zverev embrace at the end of their championship match at the Nitto ATP Finals on Sunday. © Justin Setterfield/Getty Images

Finals Club

Prominent players from the 2000s are celebrated at the Finals Club on finals day at the Nitto ATP Finals on Sunday. © Peter Staples/ATP World Tour

01 Kuerten Selfie Nitto ATP Finals 2018 Sunday

Ram, Kuerten, Erlich

Andy Ram, Gustavo Kuerten and Jonathan Erlich pose for a selfie at the Finals Club on Sunday. © Peter Staples/ATP World Tour

Kuerten, Takasaki

Gustavo Kuerten meets Hideo Takasaki, President, CEO and COO of Nitto at the Nitto ATP Finals on Sunday. © Peter Staples/ATP World Tour

01-Mahut-Herbert-Nitto-ATP-Finals-2018-Final

Herbert, Mahut

Pierre-Hugues Herbert watches on as Nicolas Mahut strikes a volley on Sunday in the doubles final at the Nitto ATP Finals. © Julian Finney/Getty Images

Zverev, Beckham

Alexander Zverev meets Romeo Beckham and David Beckham after beating Novak Djokovic to win the Nitto ATP Finals on Sunday. © Peter Staples/ATP World Tour

Sock, Bryan

Jack Sock and Mike Bryan celebrate lifting the doubles crown at the Nitto ATP Finals. © Julian Finney/Getty Images

Zverev

Alexander Zverev celebrates with his dog, Lovik, and parents after beating Novak Djokovic to win the Nitto ATP Finals on Sunday. © Clive Brunskill/Getty Images

Zverev

Alexander Zverev becomes the first German champion at the Nitto ATP Finals since Boris Becker in 1995. © Julian Finney/Getty Images

Djokovic

Novak Djokovic falls short of tying Roger Federer's record of six Nitto ATP Finals titles. © Justin Setterfield/Getty Images

Zverev Djokovic

Alexander Zverev seeks the biggest title of his career in the Nitto ATP Finals championship against five-time winner Novak Djokovic. © Julian Finney/Getty Images

Zverev

Alexander Zverev is trying to become the first German to win the Nitto ATP Finals since 1995. © Julian Finney/Getty Images

Nitto ATP Finals 2018 Day 7

Anderson

Kevin Anderson is the first African player to reach the semi-finals at the Nitto ATP Finals. © AFP/Getty Images

Djokovic

Novak Djokovic is yet to drop a set at the 2018 Nitto ATP Finals. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic waits to enter Centre Court at The O2 ahead of his semi-final clash against Kevin Anderson at the Nitto ATP Finals on Saturday. © Julian Finney/Getty Images

Farah, Cabal

Robert Farah and Juan Sebastian Cabal have lifted 11 tour-level doubles titles as a team. © Justin Setterfield/Getty Images

Federer

Roger Federer ends his 2018 season with a 48-10 record, having lifted four tour-level trophies. © Peter Staples/ATP World Tour

Federer

Roger Federer is aiming to lift his 100th tour-level trophy at the Nitto ATP Finals. © Justin Setterfiled/Getty Images

Herbert, Mahut

Pierre-Hugues Herbert and Nicolas Mahut will meet Mike Bryan and Jack Sock in the championship match at the Nitto ATP Finals on Sunday. © Clive Brunskill/Getty Images

Herbert, Mahut

Pierre-Hugues Herbert and Nicolas Mahut have lifted two tour-level trophies as a team this season. © Justin Setterfield/Getty Images

Luis, Taffarel

Athletico Madrid defender Felipe Luis and former Brazil goalkeeper Claudio Taffarel watch Novak Djokovic and Kevin Anderson's semi-final encounter at the Nitto ATP Finals on Saturday. © Peter Staples/ATP World Tour

Smalling

Manchester United defender Chris Smalling watches Alexander Zverev defeat Roger Federer at the Nitto ATP Finals on Saturday. © Peter Staples/ATP World Tour

02 Sock Ball Kid Bryan Nitto ATP Finals 2018 Saturday

Sock, Matthews, Bryan

Jack Sock meets ball kid Jessica Matthews after their collision during his semi-final alongside Mike Bryan at the Nitto ATP Finals on Saturday.

Zverev

Alexander Zverev defeats Roger Federer in straight sets at the Nitto ATP Finals on Saturday. © Julian Finney/Getty Images

Zverev

Alexander Zverev is the youngest semi-finalist at the Nitto ATP Finals since Juan Martin del Potro in 2009. © AFP/Getty Images

Zverev

Alexander Zverev becomes the first German since 1996 to reach the championship match at the Nitto ATP Finals. © Peter Staples/ATP World Tour

Murray, Soares

Jamie Murray and Bruno Soares have lifted three tour-level trophies this year. © Clive Brunskill/Getty Images

Sock, Bryan

Jack Sock and Mike Bryan have captured two Grand Slam titles this year. © AFP/Getty Images

Zverev, Federer

Alexander Zverev and Roger Federer pose for photos before their semi-finals on Saturday at the Nitto ATP Finals. © Julian Finney/Getty Images

Djokovic

Novak Djokovic is pursuing his sixth title at the Nitto ATP Finals. © Julian Finney/Getty Images

Federer

Roger Federer falls short in his pursuit of a seventh Nitto ATP Finals title, losing against Alexander Zverev. © Peter Staples/ATP World Tour

Mahut Herbert

Nicolas Mahut and Pierre-Hugues Herbert advance to the championship match at the Nitto ATP Finals for the first time. © Peter Staples/ATP World Tour

Zverev Becker

Alexander Zverev and Boris Becker are the last two Germans to reach the championship match at the Nitto ATP Finals. © ATP

2018 Nitto ATP Finals Day 6

ATP Alumni

ATP Alumni members gather for a photo on Centre Court at the Nitto ATP Finals on Friday. © Peter Staples/ATP World Tour

Cilic

Marin Cilic ends Group Guga Kuerten with a 1-2 record following his straight-sets loss to Novak Djokovic at the Nitto ATP Finals on Friday. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic defeats Marin Cilic in straight sets at the Nitto ATP Finals on Friday. © Peter Staples/ATP World Tour

Herbert, Mahut

Pierre-Hugues Herbert and Nicolas Mahut celebrate qualifying for the semi-finals on Friday at the Nitto ATP Finals. © Justin Setterfield/Getty Images

Herbert, Mahut

Pierre-Hugues Herbert and Nicolas Mahut defeat Mike Bryan and Jack Sock in straight sets at the Nitto ATP Finals on Friday. © Peter Staples/ATP World Tour

Hutchins, Mayer, Sa, Muller

Chief Player Officer Ross Hutchins presents recently-retired players Florian Mayer, Andre Sa and Gilles Muller with gifts at the Nitto ATP Finals on Friday. © Peter Staples/ATP World Tour

Isner

John Isner ends his 2018 season with a 34-22 tour-level record after falling in straight sets to Alexander Zverev at the Nitto ATP Finals on Friday. © AFP/Getty Images

Kubot, Melo

Lukasz Kubot watches on as Marcelo Melo strikes a drive volley forehand on Friday at the Nitto ATP Finals. © Julian Finney/Getty Images

Kubot, Melo

Lukasz Kubot and Marcelo Melo defeat Oliver Marach and Mate Pavic in straight sets at the Nitto ATP Finals on Friday. © Peter Staples/ATP World Tour

Marach, Pavic

Oliver Marach (background) watches as Mate Pavic hits a forehand volley on Friday at the Nitto ATP Finals. © Julian Finney/Getty Images

Zverev

Alexander Zverev has lifted three tour-level trophies this season. © Peter Staples/ATP World Tour

Zverev

Alexander Zverev defeats John Isner at the Nitto ATP Finals to finish Group Guga Kuerten as runner-up on Friday. © Julian Finney/Getty Images

Zverev

Alexander Zverev takes a selfie with fans at The O2 after beating John Isner in straight sets at the Nitto ATP Finals on Friday. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic finishes round-robin play at the Nitto ATP Finals undefeated for the fifth time with a win against Marin Cilic. © Clive Brunskill/Getty Images

Djokovic

Novak Djokovic beats Marin Cilic in straight sets for the first time in four tries in 2018. © Peter Staples/ATP World Tour

2018 Nitto ATP Finals Day 5

Anderson

Kevin Anderson will face the winner of Group Guga Kuerten for a place in the Nitto ATP Finals championship match. © Peter Staples/ATP World Tour

Cabal, Farah

Juan Sebastian Cabal and Robert Farah defeat Raven Klaasen and Michael Venus in straight sets at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Cabal, Farah

Juan Sebastian Cabal and Robert Farah finish Group Llodra/Santoro with a 2-1 record. © Peter Staples/ATP World Tour

Farah, Cabal

Robert Farah watches Juan Sebastian Cabal smash on Thursday against Raven Klaasen and Michael Venus at the Nitto ATP Finals. © Peter Staples/ATP World Tour

Federer

Roger Federer advances to the semi-finals at the Nitto ATP Finals for the 15th time. © Peter Staples/ATP World Tour

Federer

Roger Federer defeats Kevin Anderson in straight sets at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Federer

Roger Federer tops Group Lleyton Hewitt with a 2-1 record. © AFP/Getty Images

Klaasen, Venus

Raven Klaasen and Michael Venus end Group Llodra/Santoro with a 1-2 record after falling in straight sets to Juan Sebastian Cabal and Robert Farah at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Kontinen, Peers

Two-time reigning champions Henri Kontinen and John Peers appear as alternates at the Nitto ATP Finals following the withdrawal of Nikola Mektic and Alexander Peya. © Alex Pantling/Getty Images

Murray, Soares

Jamie Murray and Bruno Soares will contest their third straight semi-final at the Nitto ATP Finals on Saturday. © Alex Pantling/Getty Images

Soares, Murray

Bruno Soares and Jamie Murray defeat Henri Kontinen and John Peers in three sets at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Nishikori

Kei Nishikori ends Group Lleyton Hewitt with a 1-2 record after falling in straight sets to Dominic Thiem at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Nishikori

In his three previous Nitto ATP Finals appearances, Kei Nishikori advanced to the semi-finals on two occasions. © Peter Staples/ATP World Tour

Thiem

Dominic Thiem poses for a selfie with a young fan after beating Kei Nishikori in straight sets at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Thiem

Dominic Thiem defeats Kei Nishikori in straight sets at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Thiem

Dominic Thiem is making his third straight appearance at the Nitto ATP Finals. © Peter StaplesATP World Tour

Federer

Roger Federer breaks Kevin Anderson four times to beat the South African on Thursday at the Nitto ATP Finals. © Peter Staples/ATP World Tour

Nishikori

Kei Nishikori fans cheer on the Japanese star during his match against Dominic Thiem on Thursday at the Nitto ATP Finals in London. © Peter Staples/ATP World Tour

2018 Nitto ATP Finals Day 4

Bryan, Sock

Mike Bryan and Jack Sock are appearing in just their eighth tour-level event as a team. © Julian Finney/Getty Images

Cilic

Marin Cilic defeats John Isner in three sets at the Nitto ATP Finals on Wednesday. © AFP/Getty Images

Cilic

Marin Cilic is competing at the Nitto ATP Finals for the fourth time in the past five years. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic is aiming to reach the semi-finals for the eighth time at the Nitto ATP Finals. © Julian Finney/Getty Images

Djokovic

Novak Djokovic improves to 2-0 in Group Guga Kuerten after beating Alexander Zverev in straight sets at the Nitto ATP Finals on Wednesday. © AFP/Getty Images

Djokovic

Novak Djokovic shares a joke with ball kids after beating Alexander Zverev at the Nitto ATP Finals on Wednesday. © Peter Staples/ATP World Tour

Herbert, Mahut

Pierre-Hugues Herbert and Nicolas Mahut are appearing at the Nitto ATP Finals for the fourth straight year. © AFP/Getty Images

Herbert, Mahut

Pierre-Hugues Herbert and Nicolas Mahut defeat Lukasz Kubot and Marcelo Melo in straight sets at the Nitto ATP Finals on Wednesday. © Peter Staples/ATP World Tour

Isner

John Isner will meet Alexander Zverev in his final Group Guga Kuerten match at the Nitto ATP Finals on Friday. © Julian Finney/Getty Images

Isner

John Isner has captured two tour-level trophies this season. © Peter Staples/ATP World Tour

Kubot, Melo

Lukasz Kubot and Marcelo Melo saved four of seven break points in straight-sets loss to Pierre-Hugues Herbert and Nicolas Mahut at the Nitto ATP Finals on Wednesday. © AFP/Getty Images

Marach, Pavic

Oliver Marach and Mate Pavic have lifted four tour-level trophies as a team this season. © Clive Brunskill/Getty Images

Rojer, Vallverdu, Murray

Jean-Julien Rojer, Daniel Vallverdu and Andy Murray watch Marin Cilic defeat John Isner in three sets at the Nitto ATP Finals on Wednesday. © Clive Brunskill/Getty Images

Sock, Bryan

Jack Sock and Mike Bryan sign autographs for ball kids after beating Oliver Marach and Mate Pavic at the Nitto ATP Finals on Wednesday. © Peter Staples/ATP World Tour

Zverev

At 21 years of age, Alexander Zverev is the youngest player competing at the Nitto ATP Finals this year. © Julian Finney/Getty Images

Zverev

Alexander Zverev prepares to meet Novak Djokovic, for the third time in their FedEx ATP Head2Head series (1-1), at the Nitto ATP Finals on Wednesday. © Clive Brunskill/Getty Images

Zverev

Alexander Zverev will face John Isner in his final Group Guga Kuerten match on Friday. © Peter Staples/ATP World Tour

2018 Nitto ATP Finals Day 3

Anderson

Kevin Anderson sweeps through the first set in 33 minutes against Kei Nishikori on Tuesday at the Nitto ATP Finals. © Julian Finney/Getty Images

Anderson

Kevin Anderson is aiming to become the first African player to reach the semi-finals at the Nitto ATP Finals. © Peter Staples/ATP World Tour

Anderson

Kevin Anderson defeats Kei Nishikori in straight sets at the Nitto ATP Finals on Tuesday. © Peter Staples/ATP World Tour

Farah, Cabal

Robert Farah and Juan Sebastian Cabal will meet Raven Klaasen and Michael Venus for a place in the semi-finals at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Federer

Roger Federer owns a record six Nitto ATP Finals titles. © Clive Brunskill/Getty Images

Federer

Roger Federer owns a 56-14 record at the Nitto ATP Finals. © Peter Staples/ATP World Tour

Federer

Roger Federer meets a young mascot ahead of his round-robin match against Dominic Thiem at the Nitto ATP Finals on Tuesday. © Peter Staples/ATP World Tour

Federer

Roger Federer defeats Dominic Thiem in straight sets at the Nitto ATP Finals on Tuesday. © Peter Staples/ATP World Tour

Kroos

Real Madrid star Toni Kroos watches Roger Federer defeat Dominic Thiem in straight sets at the Nitto ATP Finals on Tuesday. © AFP/Getty Images

Mektic, Peya

Nikola Mektic and Alexander Peya save six of seven break points in straight-sets loss to Raven Klaasen and Michael Venus at the Nitto ATP Finals on Tuesday. © Peter Staples/ATP World Tour

Murray, Soares

Jamie Murray and Bruno Soares qualify for the semi-finals after beating Juan Sebastian Cabal and Robert Farah at the Nitto ATP Finals on Tuesday. © Julian Finney/Getty Images

Murray, Soares

Jamie Murray and Bruno Soares defeat Juan Sebastian Cabal and Robert Farah in straight sets at the Nitto ATP Finals on Tuesday. © Peter Staples/ATP World Tour

Nishikori

Four-time participant Kei Nishikori battles hard to find a way into his match against Kevin Anderson on Tuesday at the Nitto ATP Finals. © Julian Finney/Getty Images

Nishikori

Kei Nishikori will face Dominic Thiem in his final Group Lleyton Hewitt match at the Nitto ATP Finals on Thursday. © Peter Staples/ATP World Tour

Nishikori

Kei Nishikori drops to 1-1 in Group Lleyton Hewitt after straight-sets loss to Kevin Anderson at the Nitto ATP Finals on Tuesday. © Peter Staples/ATP World Tour

Thiem

Dominic Thiem falls to 0-2 in Group Lleyton Hewitt after his straight-sets loss to Roger Federer at the Nitto ATP Finals on Tuesday. © Peter Staples/ATP World Tour

Venus, Klaasen

Michael Venus and Raven Klaasen move to 1-1 in Group Llodra/Santoro after beating Nikola Mektic and Alexander Peya at the Nitto ATP Finals on Tuesday. © Naomi Baker/Getty Images

2018 Nitto ATP Finals Day 2

Bryan

Mike Bryan celebrates his opening victory at the Nitto ATP Finals with ball kids. © Peter Staples/ATP World Tour

Cilic

Marin Cilic is making his fourth appearance at the Nitto ATP Finals. © Peter Staples/ATP World Tour

Cilic

Marin Cilic has won at least one tour-level trophy in each of the past 11 ATP World Tour seasons. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic is aiming to lift his first Nitto ATP Finals trophy since 2015. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic signs giant tennis balls for ball kids at the Nitto ATP Finals on Monday. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic won 60 per cent of second-serve return points against John Isner at the Nitto ATP Finals on Monday. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic takes a selfie with fans after defeating John isner in straight sets at the Nitto ATP Finals on Monday. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic extends his FedEx ATP Head2Head series lead against John Isner to 9-2 on Monday in London. © Peter Staples/ATP World Tour

Djokovic

Novak Djokovic begins his bid to lift a record-tying sixth Nitto ATP Finals trophy against John Isner on Monday. © Peter Staples/ATP World Tour

Herbert, Mahut

Pierre-Hugues Herbert and Nicolas Mahut saved three of five break points in straight-sets loss to Oliver Marach and Mate Pavic at the Nitto ATP Finals on Monday. © Clive Brunskill/Getty Images

Herbert, Mahut

Pierre-Hugues Herbert and Nicolas Mahut dropped just two points behind their first serves in the opening set against Oliver Marach and Mate Pavic at the Nitto ATP Finals on Monday. © Peter Staples/ATP World Tour

Isner

John Isner saves six of nine break points in straight-sets loss to Novak Djokovic at the Nitto ATP Finals on Monday. © Clive Brunskill/Getty Images

Isner

At 6'10", John Isner is the tallest player to ever compete at the Nitto ATP Finals. © Clive Brunskill/Getty Images

07 Marach Pavic Nitto ATP Finals 2018 Monday No 1

Marach, Kermode, Pavic

ATP Executive Chairman and President Chris Kermode presents Oliver Marach and Mate Pavic with the ATP World Tour World No. 1 Doubles Team trophy at the Nitto ATP Finals on Monday. © Peter Staples/ATP World Tour

Melo, Kubot

Marcelo Melo and Lukasz Kubot have lifted four tour-level trophies this season. © Julian Finney/Getty Images

Pavic, Marach

Mate Pavic and Oliver Marach defeat Pierre-Hugues Herbert and Nicolas Mahut in straight sets at the Nitto ATP Finals on Monday. © Peter Staples/ATP World Tour

Ronaldo

Juventus striker Cristiano Ronaldo watches Novak Djokovic's win over John Isner at the Nitto ATP Finals on Monday. © Peter Staples/ATP World Tour

Zverev

Alexander Zverev leads the ATP World Tour with 55 tour-level victories this season. © Clive Brunskill/Getty Images

Zverev

Alexander Zverev is making his second straight appearance at the Nitto ATP Finals. © Clive Brunskill/Getty Images

Zverev

Alexander Zverev attempts a tweener during his round-robin match against Marin Cilic at the Nitto ATP Finals on Monday. © Peter Staples/ATP World Tour

Ronaldo

Cristiano Ronaldo is thrust into action during Novak Djokovic's victory against John Isner on Monday at The O2. © AFP/Getty Images

2018 Nitto ATP Finals Day 1

Anderson

Kevin Anderson improves to 7-2 in his FedEx ATP Head2Head series against Dominic Thiem after his straight-sets win at the Nitto ATP Finals on Sunday. © Peter Staples/ATP World Tour

Anderson

Kevin Anderson has lifted two tour-level trophies at indoor hard-court events this year. © Getty Images

Anderson

Kevin Anderson defeats Dominic Thiem in straight sets at the Nitto ATP Finals on Sunday. © Julian Finney/Getty Images

Cabal, Farah

Juan Sebastian Cabal and Robert Farah, in their eighth full season as a team, are making their debut at the Nitto ATP Finals. © Clive Brunskill/Getty Images

08 Djokovic Nitto ATP Finals 2018 No 1 Trophy

Kermode, Djokovic

ATP Executive Chairman and President Chris Kermode presents Novak Djokovic with the year-end World No. 1 trophy at the Nitto ATP Finals on Sunday. © Julian Finney/Getty Images

Federer

Roger Federer owns a record six Nitto ATP Finals titles. © Peter Staples/ATP World Tour

Federer

Roger Federer owns a 55-13 record at the Nitto ATP Finals. © Peter Staples/ATP World Tour

Federer

Klaasen, Venus

Raven Klaasen and Michael Venus saved three of five break points in three set loss to Jamie Murray and Bruno Soares at the Nitto ATP Finals on Sunday. © Clive Brunskill/Getty Images

Mektic, Peya

Nikola Mektic and Alexander Peya compete as a team for the first time since the Western & Southern Open at the Nitto ATP Finals on Sunday. © Julian Finney/Getty Images

Murray, Soares

Jamie Murray and Bruno Soares defeat Raven Klaasen and Michael Venus in three sets at the Nitto ATP World Tour Finals on Sunday. © Clive Brunskill/Getty Images

Nishikori

Kei Nishikori defeats Roger Federer for the first time since 2014 at the Nitto ATP Finals on Sunday. © Clive Brunskill/Getty Images

Nishikori

Kei Nishikori improves to 43-19 at tour-level this season after beating Roger Federer at the Nitto ATP Finals on Sunday. © Peter Staples/ATP World Tour

Nishikori

Kei Nishikori poses for a selfie after beating Roger Federer for the first time in over four and a half years at the Nitto ATP Finals on Sunday. © Peter Staples/ATP World Tour

Soares, Murray

Thiem

Dominic Thiem held two set points in the second-set tie-break against Kevin Anderson at the Nitto ATP Finals on Sunday. © Clive Brunskill/Getty Images

Thiem, Willian

Venus, Klaasen

Michael Venus and Raven Klaasen held three set point in the opening set against Jamie Murray and Bruno Soares at the Nitto ATP Finals on Sunday. © Julian Finney/Getty Images

2018 Nitto ATP Finals Launch

Djokovic, Zverev

Novak Djokovic, Alexander Zverev lead the singles players on the London Underground on Friday night ahead of the 2018 Nitto ATP Finals Official Launch. © Clive Brunskill/Getty Images

02-Singles-Nitto-ATP-Finals-2018-Gala-Launch2

Singles players

The eight singles players competing at the Nitto ATP Finals take the Jubilee line on the London Underground from North Greenwich station to Westminster station to attend the Nitto ATP Finals Official Launch presented by Moët & Chandon at London's iconic Houses of Parliament on November 9, 2018 in London, England. The tournament will be played 11-18 November at The O2. © Clive Brunskill/Getty Images

03-Singles-Nitto-ATP-Finals-2018-Gala-Launch4

Singles players

The eight singles players competing at the Nitto ATP Finals take the Jubilee line on the London Underground from North Greenwich station to Westminster station to attend the Nitto ATP Finals Official Launch presented by Moët & Chandon at London's iconic Houses of Parliament on November 9, 2018 in London, England. The tournament will be played 11-18 November at The O2. © Clive Brunskill/Getty Images

04-Singles-Nitto-ATP-Finals-2018-Gala-Launch3

The eight singles players competing at the Nitto ATP Finals take the Jubilee line on the London Underground from North Greenwich station to Westminster station to attend the Nitto ATP Finals Official Launch presented by Moët & Chandon at London's iconic Houses of Parliament on November 9, 2018 in London, England. The tournament will be played 11-18 November at The O2.

The eight singles players competing at the Nitto ATP Finals take the Jubilee line on the London Underground from North Greenwich station to Westminster station to attend the Nitto ATP Finals Official Launch presented by Moët & Chandon at London's iconic Houses of Parliament on November 9, 2018 in London, England. The tournament will be played 11-18 November at The O2. © Clive Brunskill/Getty Images

05-Singles-Nitto-ATP-Finals-2018-Gala-Launch5

The eight singles players competing at the Nitto ATP Finals take the Jubilee line on the London Underground from North Greenwich station to Westminster station to attend the Nitto ATP Finals Official Launch presented by Moët & Chandon at London's iconic Houses of Parliament on November 9, 2018 in London, England. The tournament will be played 11-18 November at The O2.

The eight singles players competing at the Nitto ATP Finals take the Jubilee line on the London Underground from North Greenwich station to Westminster station to attend the Nitto ATP Finals Official Launch presented by Moët & Chandon at London's iconic Houses of Parliament on November 9, 2018 in London, England. The tournament will be played 11-18 November at The O2. © Clive Brunskill/Getty Images

06-Singles-Nitto-ATP-Finals-2018-Gala-Launch

Singles players

The eight singles players competing at the Nitto ATP Finals come together at London's iconic Houses of Parliament for the Nitto ATP Finals Official Launch presented by Moët & Chandon on November 9, 2018 in London, England. The world’s biggest indoor tennis tournament will be played 11-18 November at The O2. © Clive Brunskill/Getty Images

07-Nitto-ATP-Finals-2018-Singles-Official-Photo

Doubles players

The eight singles players competing at the Nitto ATP Finals come together at London's iconic Houses of Parliament for the Nitto ATP Finals Official Launch presented by Moët & Chandon on November 9, 2018 in London, England. The world’s biggest indoor tennis tournament will be played 11-18 November at The O2. © WONDERHATCH

08-Nitto-ATP-Finals-2018-Doubles-Official-Photo

The eight doubles teams competing at the Nitto ATP Finals come together at London's iconic Houses of Parliament for the Nitto ATP Finals Official Launch presented by Moët & Chandon on November 9, 2018 in London, England. The world’s biggest indoor tennis tournament will be played 11-18 November at The O2.

The eight doubles teams competing at the Nitto ATP Finals come together at London's iconic Houses of Parliament for the Nitto ATP Finals Official Launch presented by Moët & Chandon on November 9, 2018 in London, England. The world’s biggest indoor tennis tournament will be played 11-18 November at The O2. © WONDERHATCH

Federer, Anderson, Thiem

Roger Federer talks alongside Kevin Anderson and Dominic Thiem at the Nitto ATP Finals Official Launch on Friday night. © Clive Brunskill/Getty Images

2018 Buildup Gallery

Anderson-Lendl-Nitto-ATP-Finals-2018-Pre-Thursday2

Anderson, esposa Kelsey

Six-time former champion Roger Federer, with coach Ivan Ljubicic looking on, practises on Thursday ahead of the Nitto ATP Finals. © ATP

Isner

John Isner, who will compete at the Nitto ATP Finals for the first time, trains with his coach, David Macpherson, on Thursday ahead of the tournament. © ATP

Nishikori

Zverev, Lendl

2017 Day 8 Gallery

Dimitrov

After a two-hour, 30-minute battle against David Goffin, Grigor Dimitrov emerged with the Nitto ATP Finals trophy in his debut at The O2. © Thomas Lovelock/ATP World Tour

Dimitrov

Grigor Dimitrov finishes his debut at The O2 as an undefeated champion, beating David Goffin for the title. © Thomas Lovelock/ATP World Tour

Dimitrov

Grigor Dimitrov seeking his first Nitto ATP Finals title in his season finale debut at The O2. © Peter Staples/ATP World Tour

Dimitrov

Grigor Dimitrov celebrates the biggest title of his career with his parents at The O2 after a three-set battle. © Peter Staples/ATP World Tour

Dimitrov

Just months after claiming his first ATP World Tour Masters 1000 title in Cincinnati, Grigor Dimitrov wins the Nitto ATP Finals. © Peter Staples/ATP World Tour

Goffin

A year after debuting at The O2 as an alternate, David Goffin attempts to claim the Nitto ATP Finals trophy. © Peter Staples/ATP World Tour

Marray, Kontinen, Peers, Peers' Wife Danielle

Henri Kontinen & John Peers celebrate their second Nitto ATP Finals trophy with coach Jonathan Marray, Peers' daughter Ellie & wife Danielle. © Peter Staples/ATP World Tour

03 Kontinen-Peers-Match-Point-Nitto-ATP-Finals-2017-Sunday

Peers/Kontinen

John Peers and Henri Kontinen celebrate after defeating top-seeded Lukasz Kubot and Marcelo Melo for the fourth time this season. © Thomas Lovelock/ATP World Tour

03 Peers-Daughter-Trophy-Nitto-ATP-Finals-2017-Sunday

Ellie Peers

Ellie Peers, who was born in May, celebrates her father John's second season finale title in the trophy. © Thomas Lovelock/ATP World Tour

Sanchez, Kontinen, Peers

ATP Senior Tour Manager Fernando Sanchez with the first doubles team to win back-to-back season finales since 2003 and 2004, Henri Kontinen and John Peers. © Thomas Lovelock/ATP World Tour

04 Kontinen-Peers-Nitto-ATP-Finals-2017-Sunday

Peers Kontinen

John Peers and Henri Kontinen won four straight matches to claim the title at The O2 in London. © Thomas Lovelock/ATP World Tour

Melo Kubot

Marcelo Melo and Lukasz Kubot will finish the year atop the Emirates ATP Doubles Team Rankings. © Thomas Lovelock/ATP World Tour

Melo

Dimitrov

2017 Day 7 Gallery

Dimitrov

Grigor Dimitrov celebrates after defeating Jack Sock to advance to the championship match of the Nitto ATP Finals. © Thomas Lovelock/ATP World Tour

Dimitrov

Grigor Dimitrov hits a backhand during his match against Jack Sock at The O2 on Saturday. © Thomas Lovelock/ATP World Tour

Dimitrov

01-Federer-Goffin-Nitto-ATP-Finals-2017-Saturday

Goffin, Federer

Goffin

David Goffin stuns six-time champion Roger Federer in the semi-finals of the season finale on Saturday. © Thomas Lovelock/ATP World Tour

Goffin

David Goffin serves during his victory against Roger Federer at the Nitto ATP Finals on Saturday. © Thomas Lovelock/ATP World Tour

Sock, Dimitrov

Jack Sock and Grigor Dimitrov shake hands after their semi-final battle, which the Bulgarian won, on Saturday. © Thomas Lovelock/ATP World Tour

Sock

Jack Sock strikes a forehand against Grigor Dimitrov at the Nitto ATP Finals on Saturday. © Thomas Lovelock/ATP World Tour

Sock

Dimitrov

Grigor Dimitrov signs autographs after advancing to the championship match at the Nitto ATP Finals on Saturday. © Thomas Lovelock/ATP World Tour

Federer

02 kontinen-peers-nitto-atp-finals-2017-saturday

Peers, Kontinen

John Peers and Henri Kontinen defeat Jamie Murray and Bruno Soares to advance to the title match for the second straight year. © Thomas Lovelock/ATP World Tour

Kubot, Melo

04-Shapovalov-Kermode-Nitto-ATP-Finals-2017-Saturday

Kermode, Shapovalov

ATP Executive Chairman & President Chris Kermode with award recipient Denis Shapovalov and representatives from Fly Emirates. © Thomas Lovelock/ATP World Tour

Shapovalov

2017 Day 6 Gallery

Dimitrov

Grigor Dimitrov takes a picture with fans after a victory over Pablo Carreno Busta on Friday. © Peter Staples/ATP World Tour

Dimitrov

Grigor Dimitrov strikes a forehand during his win against Pablo Carreno Busta at The O2 on Friday. © Peter Staples/ATP World Tour

Dimitrov

Grigor Dimitrov hits an approach shot against Pablo Carreno Busta at the Nitto ATP Finals, earning his third win of the week. © Thomas Lovelock/ATP World Tour

Goffin

David Goffin earns his spot in the semi-finals of the Nitto ATP Finals with a victory against Dominic Thiem. © Thomas Lovelock/ATP World Tour

Goffin

David Goffin strikes a backhand volley during his round-robin match against Dominic Thiem on Friday. © Peter Staples/ATP World Tour

Carreno Busta

Pablo Carreno Busta strikes a forehand during his match against Grigor Dimitrov at the Nitto ATP Finals on Friday. © Peter Staples/ATP World Tour

Thiem

Dominic Thiem hits a serve in his third round-robin match against David Goffin on Friday at The O2. © Thomas Lovelock/ATP World Tour

03 Marach-And-Pavic-Nitto-ATP-Finals-2017-Friday-1

Marach, Pavic

Mate Pavic hits a volley during his win with Oliver Marach against Bob Bryan and Mike Bryan on Friday. © Peter Staples/ATP World Tour

Murray

Jamie Murray signs autographs for fans at The O2 after his victory with Bruno Soares on Friday. © Thomas Lovelock/ATP World Tour

Soares, Murray

Bruno Soares and Jamie Murray won Group Woodbridge/Woodforde with a victory over top-seeded Lukasz Kubot and Marcelo Melo. © Thomas Lovelock/ATP World Tour

Mike Bryan, Bob Bryan

Bob Bryan goes after an overhead during his match with Mike Bryan against Oliver Marach and Mate Pavic. © Thomas Lovelock/ATP World Tour

2017 Day 5 Gallery

Federer

Roger Federer strikes a backhand during his win against Marin Cilic on Thursday at The O2. © Thomas Lovelock/ATP World Tour

Federer

Roger Federer signs autographs after his win against Marin Cilic in the Nitto ATP Finals on Thursday. © Thomas Lovelock/ATP World Tour

Federer

Sock

Jack Sock celebrates his victory over Alexander Zverev on Thursday, earning a spot in Saturday's semi-finals. © Thomas Lovelock/ATP World Tour

Cilic

Zverev

Alexander Zverev pumps himself up during his match against Jack Sock on Thursday at the Nitto ATP Finals. © Thomas Lovelock/ATP World Tour

03-Harrison-Venus-Nitto-ATP-Finals-2017-Thursday

Venus, Harrison

Ryan Harrison hits a forehand during his match with Michael Venus against Jean-Julien Rojer and Horia Tecau on Thursday. © Peter Staples/ATP World Tour

Harrison-Venus-Nitto-ATP-Finals-2017-Thursday

Venus, Harrison

Ryan Harrison and Michael Venus defeat Jean-Julien Rojer and Horia Tecau in their final round-robin match on Thursday. © Thomas Lovelock/ATP World Tour

Rojer, Tecau

Jean-Julien Rojer hits a forehand volley during his match with Horia Tecau against Ryan Harrison and Michael Venus on Thursday. © Thomas Lovelock/ATP World Tour

2017 Day 4 Gallery

Thiem

Dominic Thiem slices a backhand during his three-set victory over Pablo Carreno Busta at the Nitto ATP Finals on Wednesday. © Thomas Lovelock/ATP World Tour

Dimitrov

Grigor Dimitrov cruised past David Goffin on Tuesday to secure a spot in the semi-finals at the Nitto ATP Finals. © Thomas Lovelock

Thiem

Dominic Thiem strikes a forehand during his first victory of the 2017 Nitto ATP Finals at The O2 in London on Wednesday. © Thomas Lovelock/ATP World Tour

Carreno Busta

Pablo Carreno Busta celebrates a point during his match against Dominic Thiem at The O2 on Wednesday. © Thomas Lovelock / ATP World Tour

Goffin

Dimitrov

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Soares, Murray

Bruno Soares strikes an overhead during his win with Jamie Murray against Ivan Dodig and Marcel Granollers. © Thomas Lovelock / ATP World Tour

Goffin

05-Bryan-Nitto-ATP-Finals-2017-Wednesday

Kubot, Bryan, Melo

Dimitrov

Grigor Dimitrov made it out of the Pete Sampras Group undefeated after a 6-0, 6-2 victory over David Goffin. © Thomas Lovelock

07-Kubot-Melo-Nitto-ATP-Finals-2017-Wednesday

Melo/Kubot

Marcelo Melo and Lukasz Kubot defeat Bob Bryan and Mike Bryan in round-robin play at the Nitto ATP Finals. © Thomas Lovelock/ATP World Tour

2017 Day 3 Gallery

Roger Federer strikes a forehand during his victory over Alexander Zverev on Tuesday at The O2. © Peter Staples/ATP World Tour

Federer

Roger Federer reaches for a backhand volley during his second win of the Nitto ATP Finals, beating Alexander Zverev. © Peter Staples/ATP World Tour

Federer

Roger Federer scrambles during a point against Alexander Zverev in the Nitto ATP Finals at The O2 on Tuesday. © Peter Staples/ATP World Tour

Federer speaks to ballpersons

Cilic

Sock

Eigth seed Jack Sock defeated fifth seed Marin Cilic 5-7, 6-2, 7-6(4) on Tuesday at the Nitto ATP Finals. © Thomas Lovelock

Cilic

Zverev

Alexander Zverev hits a backhand during his match against Roger Federer on Tuesday at the Nitto ATP Finals. © Peter Staples/ATP World Tour

Sock

United States' Jack Sock defeated Croatia's Marin Cilic on Tuesday for his first win at the Nitto ATP Finals in London. © Thomas Lovelock

Rojer/Tecau

Jean-Julien Rojer of the Netherlands and Horia Tecau of Romania in action at the Nitto ATP Finals on Tuesday. © Peter Staples/ATP World Tour

Harrison

Ryan Harrison lunges for a volley during his match with Michael Venus against Pierre-Hugues Herbert and Nicolas Mahut on Tuesday. © Peter Staples/ATP World Tour

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Kontinen/Peers

Match winners Henri Kontinen of Finland and John Peers of Australia in action against Jean-Julien Rojer of the Netherlands and Horia Tecau of Romania at the Nitto ATP Finals in London. © Peter Staples/ATP World Tour

Harrison/Venus

Herbert

Pierre-Hugues Herbert puts away a volley during his match with Nicolas Mahut against Ryan Harrison and Michael Venus on Tuesday. © Peter Staples/ATP World Tour

Mahut/Herbert

Nicolas Mahut and Pierre-Hugues Herbert in action on Tuesday in round-robin play at the Nitto ATP Finals. © Thomas Lovelock