Michael Phelps

Associated Press
Former Olympic swimmer Michael Phelps hits in the batting cage during a Baltimore Orioles baseball spring training workout Thursday, Feb. 21, 2013, in Sarasota, Fla.  Phelps, a native of Baltimore who was in the area filming his Golf Channel show The Haney Project, took batting practice with the team. (AP Photo/Charlie Neibergall)

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

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