Michael Phelps qualifies 1st in 100 fly

Mesa, AZ ( - What rust?

Michael Phelps came out of retirement to swim the fastest qualifying time in his first race since the 2012 London Olympics.

Phelps finished the 100-meter butterfly in 52.84 seconds to win his heat at the Arena Grand Prix on Thursday.

The world record holder in distance, Phelps edged Ryan Lochte by .10 seconds for the top overall time out of 98 swimmers to make Thursday night's final.

Phelps, 28, is also scheduled to compete in the 50-meter freestyle in Mesa, though he has pulled out of the 100 free.

He retired after winning six medals in London, saying he wanted to see more of the world than its hotels and swimming pools.

But the layoff lasted just 20 months before USA Swimming said last week Phelps would be in the Mesa field.

Three of Phelps' record 18 Olympic gold medals came in the 100 fly. He has a record 22 Olympic medals overall.