Michael Phelps

Associated Press
Olympic swimmer Michael Phelps, front row, center, smiles as he sits with fellow Olympians during a ceremony on the South Lawn of the White House in Washington, Friday, Sept. 14, 2012, where President Barack Obama welcomed the 2012 U.S. Olympic and Paralympic teams. Phelps ended his Olympic career in London with six medals and a record tally of 22 career medals. (AP Photo/Pablo Martinez Monsivais)

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

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