JANNIK SINNER has retired from the the Cincinnati Open final, sparking fears over his US Open participation.
Wimbledon champion Sinner was in action against Carlos Alcaraz.
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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 his game.
And after just 23 minutes of play, the No1 seed sat down on his chair and retired from the game.
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