Michael Phelps

Associated Press
From left, retired Hall of Fame National Football League player Jerry Rice and former U.S. Olympic swimmer Michael Phelps attend the Michael Jordan Celebrity Invitational opening night dinner, Wednesday, April, 3, 2013 in Las Vegas. (Photo by Jeff Bottari/Invision for Jordan/AP Images)

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

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