Back at the Cincinnati Open, Jannik Sinner had to abruptly retire from the final match against Carlos Alcaraz. It wasn’t really an injury that ended the match in just 22 minutes, with Sinner trailing behind the Spaniard by 0-5. Instead, it was illness that had been bothering him. But what happened at the US Open semifinal was a different story altogether.
After Felix Auger-Aliassime won the second set, and the match stood level at 6-1, 3-6, Sinner was seen getting checked by the physiotherapist. It seemed like his abdomen was causing some trouble. Nevertheless, the world No. 1 returned to the court for the third set and immediately took a lead.
Jannik Sinner is being seen by the physio after the 2nd set against Felix Auger Aliassime at the U.S. Open.
Hopefully not anything too serious. pic.twitter.com/WGQ5F45TrY
— The Tennis Letter (@TheTennisLetter) September 6, 2025
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