Kei Nishikori, of Japan, hits a return to Michael Russell in the semifinal match at the U.S. National Indoor Tennis Championships on Saturday, Feb. 15, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)
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Kei Nishikori, of Japan, hits a return to Michael Russell in the semifinal match at the U.S. National Indoor Tennis Championships on Saturday, Feb. 15, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)
