USA's Michael Phelps competes in a heat of the men's 400-meter individual medley at the 2012 Summer Olympics, Saturday, July 28, 2012, in London. (AP Photo/Michael Sohn)

Photo by: Michael Sohn

USA's Michael Phelps competes in a heat of the men's 400-meter individual medley at the 2012 Summer Olympics, Saturday, July 28, 2012, in London. (AP Photo/Michael Sohn)