The highly anticipated showdown between Jannik Sinner and Carlos Alcaraz in the Cincinnati Open final ended on a somber note. Alcaraz defeated Sinner in a walkover after the ATP World No. 1 retired with an illness in the first set.

The highly-anticipated final at the Cincinnati Open came to a sad ending on Monday, as World No. 1 Jannik Sinner was forced to retire from the match against No. 2 Carlos Alcaraz while trailing 5-0 due to illness. With the result, Alcaraz wins his third Masters 1000 title of the season and his eighth overall in his storied young career.

It was only the third time the Cincinnati Open men’s final ended in a retirement, and the first since 2011 when Novak Djokovic stopped playing in the second set because of a shoulder injury.