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AP Argentina's Juan Martin Del Potro wipes his face during his match against Ryan Harrison in the third round of play at the 2012 US Open tennis tournam - Photo

Argentina's Juan Martin Del Potro wipes his face during his match against Ryan Harrison in the third round of play at the 2012 US Open tennis tournam

Friday August 31, 11:12 PM
Argentina's Juan Martin Del Potro wipes his face during 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)