Michael Phelps reacts after competing in the 100 meter backstroke event during the Charlotte UltraSwim Grand Prix in Charlotte, North Carolina, May 16, 2009 .

　　Michael Phelps smiles after winning the final of the men's 100 butterfly event during the Charlotte UltraSwim Grand Prix in Charlotte, North Carolina May 15, 2009.

　　Michael Phelps talks with the media after winning the final of the men's 100 butterfly during the Charlotte UltraSwim Grand Prix in Charlotte, North Carolina May 15, 2009.

　　Swimmer Michael Phelps (L) shakes hands with Aaron Peirsol after losing in the 100 meter backstroke during the Charlotte UltraSwim Grand Prix at the Mecklenburg Aquatic Center in Charlotte, North Carolina May 16, 2009 .