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."

Jannik Sinner retired from his Cincinnati Open final against young rival Carlos Alcaraz after losing the first five games of the match and struggling with illness. The World No 1 apologised and said sorry to the fans after pulling out from the final when he lost his third service game in a row to trail Alcaraz 5-0 in the first set.

Carlos Alcaraz won the Cincinnati Open title in a little over 20 minutes Monday afternoon, after his nearest rival and world No. 1 Jannik Sinner retired through illness down 5-0. Sinner fought back tears as he was forced to quit the match, which was poised to be another instalment in the most compelling current rivalry in tennis.