• Felix Auger-Aliassime comes from behind to defeat Ben Shelton at the ATP Finals.
• Jannik Sinner secures his spot in the semifinals after beating Alexander Zverev.
• Both Auger-Aliassime and Shelton lost their opening matches prior to this contest.

Canada's Felix Auger-Aliassime secured his first victory at the ATP Finals, defeating Ben Shelton 4-6, 7-6(7), 7-5. Auger-Aliassime, who initially struggled, found his rhythm after dropping the first set and ultimately converted his third match point to seal the win, keeping his tournament hopes alive. Shelton's strong start included a break of serve, but Auger-Aliassime rallied back, showing resilience and determination throughout the match, according to Reuters and BBC.

Earlier in the round, Jannik Sinner triumphed over Alexander Zverev with a convincing score of 6-4, 6-3, thus becoming the first player to reach the semifinals of the ATP Finals. Sinner's performance included saving all seven break points he faced while dominating key moments in the match. His victory further solidifies his position as a contender for the year-end world number one ranking, requiring him to defend his title while hoping for Carlos Alcaraz's defeat in his final group match, according to BBC and Al Jazeera.

Both Auger-Aliassime and Shelton, who had lost their opening matches, needed this clash to maintain a chance of advancing in the tournament. Auger-Aliassime's ability to turnaround the match against Shelton came as he discussed a "weird start" but managed to adapt and capitalize on Shelton's errors, showcasing his tactical awareness as the match progressed, according to BBC and Al Jazeera.