Carlos Alcaraz returns a shot against Jannik Sinner during the Cincinnati Open's men's singles championship match at the Lindner Family Tennis Center.

Carlos Alcaraz won the Cincinnati Open title in a little more than 20 minutes on Monday after top-ranked Jannik Sinner was forced to retire because of illness during the first set.

Meeting in the final for the fourth time this year and first since Wimbledon, Sinner fell behind 5-0 in the first set with nine unforced errors. He was seen with an icepack on his head during a break and retired after playing just 22 minutes.

Sinner, who turned 24 on Saturday, was on a 12-match winning streak and had won 26 straight matches on hard courts. He was bidding to become the first player to win back-to-back men’s Cincinnati Open titles since Roger Fed

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