Kei Nishikori, of Japan, reacts after defeating Ivo Karlovic, of Croatia, in the singles final at the U.S. National Indoor Tennis Championships, Sunday, Feb. 16, 2014, in Memphis, Tenn. Nishikori won 6-4, 7-6 (0). (AP Photo/Rogelio V. Solis)

Memphis Tennis

Kei Nishikori, of Japan, reacts after defeating Ivo Karlovic, of Croatia, in the singles final at the U.S. National Indoor Tennis Championships, Sunday, Feb. 16, 2014, in Memphis, Tenn. Nishikori won 6-4, 7-6 (0). (AP Photo/Rogelio V. Solis)

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