Michael Phelps

Associated Press
Whitney Phelps is joined by her bother, Olympic swimming champion Michael Phelps, as as she announces that she will run the ING New York City Marathon with Team SUBWAY at the Chelsea Piers Sport Center, Monday, Oct. 15, 2012 in New York. (Photo by Jason DeCrow/Invision for SUBWAY/AP Images)

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

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