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.

Jannik Sinner retires 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 ATP Cincinnati Open title on Monday after defending champion Jannik Sinner retired due to illness during the first set.Alcaraz is the third Spaniard to win the pre-US Open title here after Carlos Moya and Rafael Nadal.