**FILE** Jack Sock, left, of Lincoln, Neb., passes Andy Roddick, right, of Omaha, Neb., during their match at the U.S. Open tennis tournament in New York, Friday, Sept. 2, 2011. (AP Photo/Charles Krupa)
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**FILE** Jack Sock, left, of Lincoln, Neb., passes Andy Roddick, right, of Omaha, Neb., during their match at the U.S. Open tennis tournament in New York, Friday, Sept. 2, 2011. (AP Photo/Charles Krupa)
