Denis Kudla, of the United States, hits a return to Yen-hsun Lu, of Taiwan, at the U.S. National Indoor Tennis Championships on Thursday, Feb. 13, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

Memphis Tennis

Denis Kudla, of the United States, hits a return to Yen-hsun Lu, of Taiwan, at the U.S. National Indoor Tennis Championships on Thursday, Feb. 13, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

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