Jannik Sinner defeated Alexander Zverev 6-4, 6-3 in the round-robin stage of the ATP Tour Finals on hard court. As the heavy pre-match favourite at 1.13 odds, Sinner delivered a commanding performance that justified his status, with Zverev unable to mount a sustained challenge despite entering as a considerable underdog at 7.21. The Italian's control was evident across both sets, breaking serve at critical moments and maintaining the consistency required to dominate the season's year-end championship. This victory reinforces Sinner's credentials as the tournament's leading contender and strengthens his positioning within the round-robin group.