Juan Sebastian Cabal and Robert Farah will compete at the Nitto ATP Finals for the third time, having reached the semi-finals in 2018 (l. to Herbert/Mahut) and 2019 (l. to Klaasen/Venus) at The O2 in London.

The Colombians have won three ATP Tour titles in 2021 at the Dubai Duty Free Tennis Championships (d. Mektic/Pavic), the Barcelona Open Banc Sabadell (d. Krawietz/Tecau) and the Erste Bank Open in Vienna (d. Ram/Salisbury). They also reached the Great Ocean Road Open final in Melbourne.