Kei Nishikori of Japan celebrates his victory over Novak Djokovic of Serbia during their US Open 2014 men's singles semifinals match at the USTA Billie Jean King National 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/TIMOTHY A. CLARY        (Photo credit should read TIMOTHY A. CLARY/AFP via Getty Images)