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Kei Nishikori of Japan celebrates his win over Novak Djokovic of Serbia during their 2014 US Open men's semifinal singles match at the USTA Billie Jean King National Tennis Center September 6, 2014 in New York. Nishikori stunned Djokovic 6-4, 1-6, 7-6 (7/4) 6-3 at the US Open on Saturday to become the first Asian man to reach a Grand Slam final. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

Kei Nishikori of Japan celebrates his win over Novak Djokovic of Serbia during their 2014 US Open men's semifinal singles match at the USTA Billie Jean King National Tennis Center September 6, 2014 in New York. Nishikori stunned Djokovic 6-4, 1-6, 7-6 (7/4) 6-3 at the US Open on Saturday to become the first Asian man to reach a Grand Slam final.  AFP PHOTO/Stan HONDA        (Photo credit should read STAN HONDA/AFP/Getty Images)