**FILE** Jack Sock returns a shot to Feliciano Lopez, of Spain, in a quarterfinal round tennis match at the U.S. National Indoor Championships on Friday, Feb. 22, 2013, in Memphis, Tenn. (AP Photo/Mark Humphrey)
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**FILE** Jack Sock returns a shot to Feliciano Lopez, of Spain, in a quarterfinal round tennis match at the U.S. National Indoor Championships on Friday, Feb. 22, 2013, in Memphis, Tenn. (AP Photo/Mark Humphrey)
