WASHINGTON — Nick Kyrgios overcame early back spasms to get the better of Russia’s Daniil Medvedev in a pair of tiebreakers and win the Citi Open in Washington on Sunday.

The Australian won 7-6(6) 7-6(4) over a frustrated world number nine Medvedev for his sixth career ATP Tour victory. Kyrgios did not face a single break point and hit 18 aces, including two to close out the final.

Kyrgios, mixing baseline rallies with drop shots, came from 4-1 down in the opening tiebreak to win it and took a medical time-out after the set, which seemed to help relieve the back spasms that had him stretching on the court during changeovers.

He still had trouble with Medvedev’s serve, the Russian winning 80% of his service points for the match. Kyrgios eventually tied the second set at 6-6 and claimed the victory, his second of the year, in another tiebreak.

Before serving for the win, the Australian, as he had done twice previously in the match, went to a spectator to consult on where to serve.

Kyrgios then delivered a rocket for the win and fell on his back in relief. — Reuters