Michael Phelps wins 200-meter butterfly heat at U.S. Olympic Trials

OMAHA, Neb. -- After two days of watching, Michael Phelps finally got into the water at the U.S. Olympic swim trials Tuesday morning, winning his preliminary heat of the 200-meter butterfly.

Phelps finished in 1 minute, 56.68 seconds -- the fastest in the morning -- and was .22 seconds ahead of Pace Clark.

"My third turn was bad, awful," Phelps said. "Killed all the momentum. I felt like I didn't really use much legs, dragging them through the way. But it's something to build off of. We'll see."

In each of his four previous appearances at Olympic trials, Phelps competed in the 400 IM on the meet's first day. However, he has not competed in that grueling event since finishing fourth at the London Olympics in 2012.

Phelps had originally been entered in Monday's 200-meter freestyle but later scratched to focus on the 200 fly, where he owns the top four performances in the race's history.

"I just wanted to swim," Phelps said. "That was the most annoying part: Having to wait this long. But I'm happy to get the first one out of the way and just keep going."

Last year at the U.S. Nationals in San Antonio, Phelps turned in the year's fastest time in the 200 fly at 1:52.94. He'll look to edge closer to that mark in Tuesday night's semifinals.

In other events, Katie Ledecky, who already qualified for Rio in the 400 freestyle, easily advanced to the semifinals of the 200-meter freestyle with a time of 1:55.60. Leah Smith was second in 1:56.47.

Missy Franklin tied for seventh with Hali Flickinger in 1:58.61, and will face a busy night. She will swim the semifinals shortly before 8 p.m. EDT and return about 15 minutes later for the 100 backstroke final in a bid to make her second straight Olympic team.

Defending Olympic champion Allison Schmitt qualified fourth-fastest for the 200 free semis in 1:57.77.

The Associated Press contributed to this report.