Kei Nishikori, of Japan, reacts after defeating Stan Wawrinka, of Switzerland, in five sets during the quarterfinals of the 2014 U.S. Open tennis tournament, Wednesday, Sept. 3, 2014, in New York. (AP Photo/Mike Groll)
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Kei Nishikori, of Japan, reacts after defeating Stan Wawrinka, of Switzerland, in five sets during the quarterfinals of the 2014 U.S. Open tennis tournament, Wednesday, Sept. 3, 2014, in New York. (AP Photo/Mike Groll)
