Michael Phelps

Associated Press
United States' gold medallist Michael Phelps, front, walks with South Africa's silver medallist Chad le Clos behind him after the medal ceremony for the men's 100-meter butterfly swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Friday, Aug. 3, 2012. (AP Photo/Matt Slocum)

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

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