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)

Memphis Tennis

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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