Other competitors in the May 14-17 meet in North Carolina include Olympic gold medalists Nathan Adrian, Natalie Coughlin and Ryan Lochte.
               
Phelps only returned to competition last month in Arizona after serving a six-month ban for a drunk driving conviction.
               
The 18-times Olympic gold medalist, who turns 30 next month, won two events and earned three medals from three finals at the Arizona meet.
               
In the opening-day, Phelps won the 100 meters butterfly in 52.38 seconds over long-time rival Lochte.
               
On the second day of competition, Phelps scratched the 100m backstroke to focus on the 400m freestyle preliminary and finished 17th overall in 4:02.67.
               
On the closing day, Phelps won the 100m freestyle in 49.72, and was third in the 200 individual medley at 2:00.01.

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