Juan Martin Del Potro
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Novak Djokovic returns to Juan Martin del Potro in a quarterfinal of the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. Djokovic won in straight sets. (AP Photo/Charles Krupa)

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Andy Roddick watches the ball during his match with Argentina's Juan Martin Del Potro in the fourth round of play at the 2012 US Open tennis tournament, Wednesday, Sept. 5, 2012, in New York. (AP Photo/Charles Krupa)

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Andy Roddick reacts during his match with Argentina's Juan Martin Del Potro in the quarterfinals of the 2012 US Open tennis tournament, Wednesday, Sept. 5, 2012, in New York. (AP Photo/Charles Krupa)

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Andy Roddick reacts as rain forces a delay in his match against Argentina's Juan Martin Del Potro in the quarterfinals of the 2012 US Open tennis tournament, Tuesday, Sept. 4, 2012, in New York. (AP Photo/Charles Krupa)

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** FILE ** Roger Federer of Switzerland leans on the net after he defeated Juan Martin del Potro of Argentina at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Friday, Aug. 3, 2012. (AP Photo/Elise Amendola)

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Roger Federer of Switzerland celebrates after defeating Juan Martin del Potro of Argentina at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Friday, Aug. 3, 2012. (AP Photo/Elise Amendola)

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FILE - In this Jan. 24, 2010, file photo, Juan Martin del Potro of Argentina, waves as he leaves the court after his loss to Marin Cilic of Croatia in a fourth round match at the Australian Open tennis championship in Melbourne, Australia. A person familiar with Juan Martin del Potro's plans tells The Associated Press that the 2009 U.S. Open champion will not defend his title at the year's last Grand Slam tournament. The person spoke to the AP on Saturday, Aug. 21, 2010, on condition of anonymity because an official announcement has not been made. (AP Photo/Andy Wong, File)

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** FILE ** Juan Martin del Potro of Argentina hits a forehand to Spain's Rafael Nadal during their semifinals match at the U.S. Open tennis tournament in New York on Sunday, Sept. 13, 2009. (AP Photo/Charles Krupa)