NEW YORK, NY - SEPTEMBER 06: Kei Nishikori of Japan returns a shot against Novak Djokovic of Serbia during their men's singles semifinal match on Day Thirteen of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 6, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
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