Michael Phelps

Associated Press
FILE - In this Aug. 14, 2004 file photo, Michael Phelps of the U.S. reacts after winning the 400m individual medley at the Olympic Games Saturday, Aug. 14, 2004 in Athens.  Phelps retires with twice as many golds as any other Olympian, and his total of 22 medals is easily the best mark. (AP Photo/Rusty Kennedy, File)

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

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