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

Memphis Tennis

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

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