Michael Phelps

Associated Press
FILE - This Sept. 10, 2012 file photo shows Michael Phelps smiling during a celebration of the achievements of Maryland Olympians,  in Baltimore. The most decorated Olympian will join David Feherty for a special, Ryder Cup-themed edition of "Feherty Live." The show will air on the Golf Channel on Wednesday, Sept. 26, 2012, two days before the Ryder Cup begins at Medinah in suburban Chicago. (AP Photo/Steve Ruark, File)

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Olympic champion Michael Phelps has announced his intention to retire after the London Olympics. 

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