Michael Russell, of the United States, hits a return 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)

Memphis Tennis

Michael Russell, of the United States, hits a return 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)

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