Michael Phelps

Associated Press
(L-R) Michael Phelps and David Feherty are seen at Golf Channel's 'Feherty Live From the Ryder Cup', on Monday, September 24, 2012 at the Tivoli Theatre in Downers Grove, IL. Phelps and Feherty are watching a video interview from the Olympics in London.
(Ross Dettman /AP Images for Golf Channel)

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

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