Tommy Paul vs Flavio Cobolli — QF — Cincinnati Open

The decider turned on whose serve held up. Cobolli won 92 percent of his first-serve points in the third while Paul managed 60, and the seventh seed, 1 of 5 on break chances in the set, needed only the last of them, a break in game 9 for 5-4 that was the set's only one. Paul out-hit him and still lost. The 18th seed hit 28 winners to 19 and took 82 of the 163 points, but his unforced errors climbed from 9 in the opener to 17 in the third. Cobolli had been pushed to a decider in each of his first three matches here, one of them from a set down, and this one ran 1 hour 57 minutes to a semifinal.