Overview
- Jannik Sinner began his ATP Finals title defense by defeating Félix Auger-Aliassime 7-5, 6-1, extending his indoor winning streak to 27 and not facing a break point.
- Taylor Fritz beat late entrant Lorenzo Musetti 6-3, 6-4, leaving both Fritz and Carlos Alcaraz at 1-0 in the Jimmy Connors group.
- Alcaraz opened with a 7-6(5), 6-2 win over Alex de Miñaur, marking his first-ever opening-match victory at the ATP Finals.
- Tuesday’s Alcaraz–Fritz match will send the winner into the semifinals, with the loser retaining a final group match to stay alive.
- Novak Djokovic withdrew before the event and was replaced by Musetti, while in doubles Horacio Zeballos and Marcel Granollers upset reigning champions Kevin Krawietz and Tim Puetz.