Fans wave signs behind Kei Nishikori of Japan, as he takes a water break between games during his finals match against Ivo Karlovic, of Croatia, at the U.S. National Indoor Tennis Championships, Sunday, Feb. 16, 2014, in Memphis, Tenn. Nishikori won 6-4, 7-6 (0). The signs read, from left,  "Two consecutive championships"' "Nishikori V" and "Nishikori won the championship."  (AP Photo/Rogelio V. Solis)

Memphis Tennis

Fans wave signs behind Kei Nishikori of Japan, as he takes a water break between games during his finals match against Ivo Karlovic, of Croatia, at the U.S. National Indoor Tennis Championships, Sunday, Feb. 16, 2014, in Memphis, Tenn. Nishikori won 6-4, 7-6 (0). The signs read, from left, "Two consecutive championships"' "Nishikori V" and "Nishikori won the championship." (AP Photo/Rogelio V. Solis)

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