Olympic swimming gold medalist Michael Phelps, left, shakes hands with Olympic gold medalist Aaron Peirsol after Peirsol won the men's final 100 meter backstroke during the USA Swimming Grand Prix Series Charlotte Ultraswim in Charlotte, N.C. , Saturday, May 16, 2009. Peirsol's winning time was 53.32 seconds. Phelps recorded a time of 53.79 seconds. AP Photo logo AP Photo 8 months ago

Olympic swimming gold medalist Michael Phelps, left, shakes hands with Olympic gold medalist Aaron Peirsol after Peirsol won the men's final 100 meter backstroke during the USA Swimming Grand Prix Series Charlotte Ultraswim in Charlotte, N.C. , Saturday, May 16, 2009. Peirsol's winning time was 53.32 seconds. Phelps recorded a time of 53.79 seconds.