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AP Argentina's Juan Martin Del Potro signs autographs after his match against Ryan Harrison in the third round of play at the 2012 US Open tennis tourna - Photo

Argentina's Juan Martin Del Potro signs autographs after his match against Ryan Harrison in the third round of play at the 2012 US Open tennis tourna

Friday August 31, 11:12 PM
Argentina's Juan Martin Del Potro signs autographs after his match against Ryan Harrison in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, 2012, in New York. (AP Photo/Paul Bereswill)