FILE - In this July 31, 2012 file photo, United States' Michael Phelps poses with his gold medal for the men's 4x200-meter freestyle relay swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. Phelps retires with twice as many golds as any other Olympian, and his total of 22 medals is easily the best mark. Phelps' Olympic success was a major sports story of 2012. (AP Photo/Matt Slocum, File)

Associated Press
FILE - In this July 31, 2012 file photo, United States' Michael Phelps poses with his gold medal for the men's 4x200-meter freestyle relay swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. Phelps retires with twice as many golds as any other Olympian, and his total of 22 medals is easily the best mark. Phelps' Olympic success was a major sports story of 2012. (AP Photo/Matt Slocum, File)
FILE - In this July 31, 2012 file photo, United States' Michael Phelps poses with his gold medal for the men's 4x200-meter freestyle relay swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. Phelps retires with twice as many golds as any other Olympian, and his total of 22 medals is easily the best mark. Phelps' Olympic success was a major sports story of 2012. (AP Photo/Matt Slocum, File)
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