Michael Phelps

Associated Press
FILE - In this Aug. 17, 2008 file photo, United States' Michael Phelps celebrates after winning his 8th gold medal after the men's  4x100-meter medley relay final 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/David J. Phillip, File)

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

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