JANNIK SINNER has retired from the Cincinnati Open final, sparking fears over his US Open participation.

Wimbledon champion Sinner was in action against Carlos Alcaraz .

However, the Italian put down his racquet and withdrew from the match before a set had even been completed.

Alcaraz had soared into a 5-0 lead, with Sinner clearly off the pace.

And after just 23 minutes of play, the No1 seed sat down on his chair and retired from the game, saying he felt like he could collapse.

Sinner told trainers and a tournament official: "I cannot move - I feel like I can collapse."

He apologised to fans as medics rushed over to treat him.

Sinner was heard saying: "I tried, but I can't. I'm sorry for the fans."

The umpire announced Sinner's retirement as an illness rather than an injury, a

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