Jack Sock watches his return to Jiri Vesely, of Czech Republic, in the second round match at the U.S. National Indoor Tennis Championships on Wednesday, Feb. 12, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)
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Jack Sock watches his return to Jiri Vesely, of Czech Republic, in the second round match at the U.S. National Indoor Tennis Championships on Wednesday, Feb. 12, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)
