Michael Phelps

Associated Press
United States' Michael Phelps gets out of the water after swimming butterfly in the men's 4 X 100-meter medley relay at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics, London, Saturday, Aug. 4, 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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