Michael Phelps

Associated Press
Olympic swimming champion Michael Phelps joins his sister Whitney in the pool for a cross training swim as she prepares to 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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