Andy Roddick

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Andy Roddick reacts after beating Australia's Bernard Tomic in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, 2012, in New York. (AP Photo/Charles Krupa)

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Andy Roddick returns a shot to Rhyne Williams at the 2012 US Open tennis tournament, Tuesday, Aug. 28, 2012, in New York. (AP Photo/Kathy Willens)

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Andy Roddick returns a shot to Rhyne Williams at the 2012 US Open tennis tournament, Tuesday, Aug. 28, 2012, in New York. (AP Photo/Kathy Willens)

Novak Djokovic of Serbia celebrates his victory over Andy Roddick of the United States at the All England Lawn Tennis Club in Wimbledon, London, at the 2012 Summer Olympics, Tuesday, July 31, 2012. (AP Photo/Elise Amendola)

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Andy Roddick's loss to 88th-ranked Nicolas Mahut dropped him to 7-10 this season, 0-4 on clay. He exited a Grand Slam tournament in the first round for the first time since 2007. (Associated Press)

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Andy Roddick of the U.S. reaches for a forehand return to Australia's Lleyton Hewitt during their second round match at the Australian Open tennis championship, in Melbourne, Australia, Thursday, Jan. 19, 2012. (AP Photo/John Donegan)

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Rafael Nadal of Spain hits a ball into the stands after winning a quarterfinal match against Andy Roddick at the U.S. Open tennis tournament in New York, Friday, Sept. 9, 2011. (AP Photo/Matt Slocum)

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Andy Roddick, of the United States, acknowledges the crowd after defeating Jack Sock, also of the United States, 6-3, 6-3, 6-4 during the U.S. Open tennis tournament in New York, Friday, Sept. 2, 2011. (AP Photo/Charles Krupa)

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Spain's Feliciano Lopez, left, shakes hands after defeating Andy Roddick of the US in their match at the All England Lawn Tennis Championships at Wimbledon, Friday, June 24, 2011. (AP Photo/Alastair Grant)

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Andy Roddick, of the United States, returns a shot to fellow countryman James Blake during a BNP Paribas Open tennis tournament match in Indian Wells, Calif, that took place in the middle of March. Earlier this month, for the first time in more than 35 years of computerized rankings, no player from the U.S. appeared in the ATP or WTA top 10. Plus, the last American man to win a Grand Slam singles title was Roddick, at the 2003 U.S. Open - 29 major tournaments ago. (AP Photo/Darron Cummings, File)

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U.S. tennis player Andy Roddick attends a press conference after the draw for the upcoming Davis Cup tennis tournament between Chile and U.S. in Santiago, Chile, Thursday March 3, 2011. (AP Photo/Roberto Candia)

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Andy Roddick rests between games while playing Milos Raonic, of Canada, in the championship match of the Regions Morgan Keegan Championships tennis tournament, Sunday, Feb. 20, 2011, in Memphis, Tenn. Roddick said he woke up Sunday morning feeling so bad he thought about withdrawing. Roddick won the match 7-6 (7), 6-7 (11), 7-5. (AP Photo/Mark Humphrey)