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AP Ryan Harrison returns a shot to Argentina's Juan Martin Del Potro in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, - Photo

Ryan Harrison returns a shot to Argentina's Juan Martin Del Potro in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31,

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