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Andy Roddick reacts after losing to Juan Martin Del Potro in the quarterfinals during the 2012 US Open tennis tournament, Wednesday, Sept. 5, 2012, in New York. Roddick said he would retire after the match. (AP Photo/Darron Cummings)

Andy Roddick reacts after losing to Juan Martin Del Potro in the quarterfinals during the 2012 US Open tennis tournament, Wednesday, Sept. 5, 2012, in New York. Roddick said he would retire after the match. (AP Photo/Darron Cummings)