NEW YORK, NY - SEPTEMBER 3 : Kei Nishikori of Japan returns the ball to Stan Wawrinka of Switzerland (not seen) during men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center in New York, United States on September 3, 2014. (Photo by Bilgin Sasmaz/Anadolu Agency/Getty Images)
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