Kei Nishikori

Novak Djokovic celebrates match point against Kei Nishikori in the U.S. Open semifinals at the USTA Billie Jean King National Tennis Center.
USA TODAY Images
September 07, 2018 - 10:16 pm
Rafael Nadal felt the pain sear into his right knee early in his U.S. Open semifinal, on what he called "a bad movement." It was a familiar pain, one that he's dealt with off-and-on for years.
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