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

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

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

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Ivo Karlovic, of Croatia, serves to Kei Nishikori, of Japan, in the singles final at the U.S. National Indoor Tennis Championships on Sunday, Feb. 16, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

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

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

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

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Michael Russell , of the United States, reacts after losing a point to Kei Nishikori, of Japan, in the semifinals of the U.S. National Indoor Tennis Championships on Saturday, Feb. 15, 2014 in Memphis, Tenn. Nishikori won 6-3, 6-2. (AP Photo/Rogelio V. Solis)