Jannik Sinner is forced to retire from the Cincinnati Open final against Carlos Alcaraz with illness, only six days before he begins his US Open title defence.

Carlos Alcaraz won the Cincinnati Open on Monday after Jannik Sinner was forced to retire due to illness. Alcaraz was already up big on Sinner, the World No. 1, when he had to retire. Sinner told the crowd that he hoped to play after feeling bad overnight, but he couldn't make it work.

Carlos Alcaraz won the Cincinnati Open after top seed Jannik Sinner retired as he was feeling unwell on Monday, raising concerns about the Italian's fitness just days before he is due to begin the defence of his U.