Michael Phelps

Associated Press
FILE - In this Aug. 16, 2008 file photo, United States' Michael Phelps reacts as he wins gold in the final of the men's  100-meter freestyle during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing. Phelps retires with twice as many golds as any other Olympian, and his total of 22 medals is easily the best mark.  (AP Photo/Mark Baker, File)

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

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