Michael Phelps enters two events at Charlotte Grand Prix

He competed in two events at the Mesa Grand Prix, finishing second to longtime rival Ryan Loche in the 100 fly. He also competed in the 50 freestyle, but used

Phelps has entered the 100-meter butterfly and 200 freestyle at the Charlotte Grand Prix :: Christian Petersen /Getty Images

He competed in two events at the Mesa Grand Prix, finishing second to longtime rival Ryan Loche in the 100 fly. He also competed in the 50 freestyle, but used his preliminary heat to work on his butterfly stroke.