Michael Phelps

Associated Press
FILE - In this Aug. 3, 2012, file photo, Michael Phelps, of the United States, touches the wall ahead of Chad le Clos, of South Africa, for the win in the men's 100-meter butterfly final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. Phelps has added another triumph to his list of accomplishments: The Associated Press male athlete of the year, Thursday, Dec. 20, 2012. (AP Photo/Mark J. Terrill, File)

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

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