FILE - In this Thursday, Aug. 2, 2012 file photo, United States' Michael Phelps competes in the men's 100-meter butterfly swimming semifinal at the Aquatics Centre in the Olympic Park d

 

              FILE - In this Thursday, Aug. 2, 2012 file photo, United States
FILE - In this Thursday, Aug. 2, 2012 file photo, United States' Michael Phelps competes in the men's 100-meter butterfly swimming semifinal at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. Phelps became the most decorated Olympian in history in 2012, adding to his enormous swimming haul with six more medals at the London Games, where the United States topped the winning charts once again. (AP Photo/Michael Sohn, File)