Jack Sock returns a shot during the mixed double finals against Gisela Dulko of Argentina and Eduardo Schwank of Argentina at the U.S. Open tennis tournament in New York, Friday, Sept. 9, 2011. Sock's... more 
Jack Sock returns a shot during the mixed double finals against Gisela Dulko of Argentina and Eduardo Schwank of Argentina at the U.S. Open tennis tournament in New York, Friday, Sept. 9, 2011. Sock's parter is Melanie Oudin. (AP Photo/Matt Slocum) less 
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Associated Press | Photo By Matt Slocum
Fri, Sep 9, 2011 8:14 PM EDT