Michael Phelps

Associated Press
IMAGE DISTRIBUTED FOR JORDAN - From left, former U.S. Olympic swimmer Michael Phelps, Charlotte Bobcats owner Michael Jordan and fiancee model Yvette Prieto attend the Michael Jordan Celebrity Invitational opening night dinner on 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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