Michael Phelps of the United States on his way to winning the men's 100m butterfly at the 2012 Summer Games at the Olympics Aquatic Center in London, England, on Friday, August 3, 2012. (Robert Gauthier/Los Angeles Times/MCT)
Michael Phelps of the United States on his way to winning the men's 100m butterfly at the 2012 Summer Games at the Olympics Aquatic Center in London, England, on Friday, August 3, 2012. (Robert Gauthier/Los Angeles Times/MCT)