CINCINNATI — 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.

“Didn’t feel great from yesterday,” Sinner said. “Also during the night, I thought I would recover a bit better, but it was not the case. I just tried to go out for the fans, trying to give a match. But it was not meant to be for me today.”

It was only the third time the Cincinnati Open men’s final ended in a retirement, and the first since 2011 when Novak D

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