Jack Sock, of the United States, prepares return to Guido Pella, of Argentina, during a match at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. Sock won 6-3, 6-4 (AP Photo/Alan Diaz)

Sony Open Tennis

Jack Sock, of the United States, prepares return to Guido Pella, of Argentina, during a match at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. Sock won 6-3, 6-4 (AP Photo/Alan Diaz)

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