Benjamin Becker, of Germany, hits a return to Kei Nishikori, of Japan, in a second-round match at the U.S. National Indoor Tennis Championships, Wednesday, Feb. 12, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

Memphis Tennis

Benjamin Becker, of Germany, hits a return to Kei Nishikori, of Japan, in a second-round match at the U.S. National Indoor Tennis Championships, Wednesday, Feb. 12, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

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