Kei Nishikori, of Japan, reacts after his return to Ivo Karlovic, of Croatia, in the singles final at the U.S. National Indoor Tennis Championships, Sunday, Feb. 16, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)
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Kei Nishikori, of Japan, reacts after his return to Ivo Karlovic, of Croatia, in the singles final at the U.S. National Indoor Tennis Championships, Sunday, Feb. 16, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)
