Ivo Karlovic, of Croatia, hits a backhand return to Lu Yen-hsun, of Taiwan, in the semifinals of the U.S. National Indoor Tennis Championships on Saturday, Feb. 15, 2014, in Memphis, Tenn. Karlovic won the first set 6-1, and the match after Lu retired due to injury. (AP Photo/Rogelio V. Solis)

Memphis Tennis

Ivo Karlovic, of Croatia, hits a backhand return to Lu Yen-hsun, of Taiwan, in the semifinals of the U.S. National Indoor Tennis Championships on Saturday, Feb. 15, 2014, in Memphis, Tenn. Karlovic won the first set 6-1, and the match after Lu retired due to injury. (AP Photo/Rogelio V. Solis)

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