Michael Russell, of the United States, watches his 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, watches his 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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