FILE - In this Friday, Aug. 3, 2012 file photo, United States' Michael Phelps, left, touches the wall as South Africa's Chad le Clos closes in for second place during the men's 100-meter butterfly final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (AP Photo/Mark J. Terrill, File)

Associated Press
FILE - In this Friday, Aug. 3, 2012 file photo, United States' Michael Phelps, left, touches the wall as South Africa's Chad le Clos closes in for second place during the men's 100-meter butterfly final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (AP Photo/Mark J. Terrill, File)
FILE - In this Friday, Aug. 3, 2012 file photo, United States' Michael Phelps, left, touches the wall as South Africa's Chad le Clos closes in for second place during the men's 100-meter butterfly final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (AP Photo/Mark J. Terrill, File)
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