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John Isner loses to Noah Rubin in second round of Citi Open

John Isner

John Isner, of the United States, returns the ball to Noah Rubin, of the United States, during the Citi Open tennis tournament in Washington, Thursday, Aug. 2, 2018. Rubin defeated Isner, 6-4, 7-6 (6). (AP Photo/Andrew Harnik)

AP

WASHINGTON -- A weary-looking John Isner hit serves in the low 90s mph and was broken twice in the opening set during a 6-4, 7-6 (6) loss to 152nd-ranked Noah Rubin in the second round at the Citi Open on Thursday.

The No. 2-seeded Isner was coming off a title in Atlanta last week and a semifinal run at Wimbledon last month.

His all-American matchup against Rubin originally was supposed to be played Wednesday, but was postponed because of a thunderstorm.

Rubin, whose right sneaker fell apart during a point in the second set, was scheduled to play his third-round match later Thursday. That was going to be against 16th seed Andrey Rublev, who completed a 7-6 (5), 6-4 victory over Tommy Paul earlier in the day.

In women’s action at the hard-court tuneup for the U.S. Open, Nao Hibino withdrew before her match against No. 6 seed Belinda Bencic because of an injured abdominal muscle.