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

Memphis Tennis

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

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