NEW YORK (AP) China's Peng Shuai finally reached a Grand Slam quarterfinal in her sixth try.

The 39th-ranked Peng beat a seeded player for the third straight match at the U.S. Open, defeating No. 14 Lucie Safarova 6-3, 6-4 on Sunday.

Peng had been 0-5 in fourth-round matches at major tournaments. She becomes the third Chinese player to reach a Grand Slam quarterfinal after Li Na and Jie Zheng.

Safarova was coming off a semifinal run at Wimbledon.

Peng faced only one break point and had just seven unforced errors.

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