Hunch. Jannik Sinner, who won this event in 2024 and 2025, will miss Turin this year with a knee injury, Al Jazeera reported on 12 October.
The title market resolves on the Nitto ATP Finals site (nittoatpfinals.com/en/): YES if Alexander Zverev wins the singles final on 22 November 2026, and NO if another player wins or if Zverev loses, retires or withdraws at any stage. If that page is silent, the tournament's results archive (nittoatpfinals.com/en/heritage/results-2000-2023), BBC Sport and The Guardian settle it.
We looked for cases where a tennis player ended a season as world number one for the first time, after winning two or more Grand Slam titles that year. We found ten such events since 1991, four for men and six for women. The number one won three of them.