Michael Phelps

Associated Press
South Africa's Chad le Clos, top, and United States' Michael Phelps take the start in the men's 100-meter butterfly swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics, London, Friday, Aug. 3, 2012.  (AP Photo/Jae C. Hong)

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

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