NEW YORK, NY - SEPTEMBER 03: Kei Nishikori of Japan celebrates after defeating Stan Wawrinka of Switzerland in their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014 in the Flushing neighborhood of the Queens borough of New York City. Nishikori defeated Wawrinka in five sets 3-6, 7-5, 7-6, 6-7, 6-4. (Photo by Matthew Stockman/Getty Images)
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