WASHINGTON — Daniil Medvedev fought off a match point with a 129-mph ace during a third-set tiebreak and beat Reilly Opelka to advance to the second round of the Citi Open.

Medvedev, of Russia, twisted his ankle on the final point before the tiebreak, but shook off the pain to defeat the American 6-7 (6), 6-3, 7-6 (6) in 2 hours, 26 minutes on Monday night. He will next face 14th-seeded American Steve Johnson.

In other first-round action, Henri Laaksonen of Switzerland beat Canadian Vasek Pospisil in three sets. Laaksonen next faces top-seeded Dominic Thiem.

In the women’s draw, former world No. 1 Jelena Jankovic retired while trailing Oceane Dodin 2-0 in the third set. Dodin will next face Sara Errani, who beat Risa Ozaki in straight sets.

Second-ranked Simona Halep plays her first-round match on Tuesday afternoon.

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