BEIJING (AP) — Defending champion Serena Williams has pulled out of the China Open with a left knee injury.
The top-ranked Williams had been due to face Australian Samantha Stosur in the quarterfinals on Friday.
Playing with strapping on her knee, the American beat Lucie Safarova 6-1, 1-6, 6-2 in the third round Thursday evening and then skipped her post-match press conference because of swelling in the knee.
Williams retired from the Wuhan Open a week ago during her first-round match with a viral illness. Her sister, Venus, also withdrew from the China Open this week, citing a virus.
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