Sinner retired with apparent illness in the first set of Monday's Cincinnati Open final against Alcaraz after digging a 5-0 deficit. Sinner remained on the court for the trophy ceremony and addressed his condition while speaking with the crowd. He didn't offer specifics, but said that he "didn't feel great."

The No. 1-ranked Sinner, the defending champion in singles at Flushing Meadows, was supposed to compete in mixed doubles with Katerina Siniakova.

Jannik Sinner reacts after winning the Wimbledon title July 13.© Susan Mullane-Imagn Images Jannik Sinner returns a shot during his match against Carlos Alcaraz on July 13.© Imagn Images

An illness caused top-ranked men's player Jannik Sinner to retire from the Cincinnati Open final against his rival Carlos Alcaraz on Monday after just 23 minutes of tennis. He was expected to then travel to New York and play alongside 11-time Grand Slam doubles champion Katerina Siniakova - most recently in the 2025 Wimbledon mixed doubles - in the first round of the new-look 2025 U.

Sinner admitted he got lucky in that match. World no. 1 took it as a sign and raised his level ahead of his next duel. The outcome? Convincing victories over Ben Shelton, Novak Djokovic and Carlos Alcaraz en route to his maiden Wimbledon trophy.

How to watch Jannik Sinner's first match back after defeating Carlos Alcaraz in the Wimbledon final last month.

Sunday, Jannik Sinner won the Wimbledon title to end a similar exchange between him and Carlos Alcaraz, on hard courts and natural surfaces. Like Nadal’s 17 years ago, this was the first “away ...

Jannik Sinner of Italy returns to Pedro Martinez of Spain during a third round men’s singles match at the Wimbledon Tennis Championships in London, Saturday, July 5, 2025.

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How deep can Emma Raducanu and Jack Draper go? Who will win the mens and womens titles? Pundits including Martina Navratilova and Marion Bartoli preview tournament; The US Open is live on Sky Sports Tennis and Sky Sports+,