(Reuters) – Japanese world number one Naomi Osaka retired from her Cincinnati Masters quarter-final with an apparent knee injury on Friday.
Osaka, who was playing American Sofia Kenin, sought treatment on the knee in the third set, then pulled out. Kenin was ahead 6-4 1-6 2-0 at the time.
The injury comes less than two weeks before the start of the U.S. Open, where Osaka is the defending champion.
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