FILE - In this Friday, April 25, 2014, file photo, Michael Phelps starts the 50-meter freestyle preliminary heat during the Arena Grand Prix swim event, in Mesa, Ariz. Next up for Michael Phelps' comeback: Two events that produced Olympic gold. Phelps has entered the 100-meter butterfly and the 200 freestyle at the Charlotte Grand Prix meet in North Carolina next week, his coach, Bob Bowman, told The Associated Press on Monday, May 5, 2014. (AP Photo/Matt York, File)