Argentina's Juan Martin Del Potro reacts during his match against Argentina's Leonardo Mayer in the third round of play at the 2012 US Open tennis tournament, Sunday, Sept. 2, 2012, in New York. (AP Photo/Paul Bereswill)

Associated Press
Argentina's Juan Martin Del Potro reacts during his match against Argentina's Leonardo Mayer in the third round of play at the 2012 US Open tennis tournament,  Sunday, Sept. 2, 2012, in New York. (AP Photo/Paul Bereswill)
Argentina's Juan Martin Del Potro reacts during his match against Argentina's Leonardo Mayer in the third round of play at the 2012 US Open tennis tournament, Sunday, Sept. 2, 2012, in New York. (AP Photo/Paul Bereswill)
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