Michael Phelps

Associated Press
United States' swimmer Michael Phelps holds up a silver trophy after being honored as the most decorated Olympian at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Saturday, Aug. 4, 2012. Phelps was honored with a special individual ceremony after concluding his record-breaking career Saturday as the most decorated Olympian. Phelps pushed the United States in front to win the medley relay Saturday in the final swimming event of the London Games, after which he is retiring.(AP Photo/Lee Jin-man)

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

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