Ivo Karlovic of Croatia prepares to return to Lu Yen-hsun, of Taiwan, during the semifinals of the U.S. National Indoor Tennis Championships on Saturday, Feb. 15, 2014 in Memphis, Tenn. Karlovic won ... more 
Ivo Karlovic of Croatia prepares to return to Lu Yen-hsun, of Taiwan, during 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) less 
1 / 1
Associated Press | Photo By Rogelio V. Solis
Sat, Feb 15, 2014 7:06 PM EST