Michael Phelps

Associated Press
Former Team SUBWAY marathoner Jared Fogle "The SUBWAY Guy," passes the Footlong baton to Whitney Phelps, sister of Olympic swimming champion Michael Phelps, as Whitney 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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