Long Beach, Calif. ? Not so fast on those seven gold medals for Michael Phelps.

Aaron Peirsol sent a clear message to the world’s greatest swimmer Monday, setting a world record in the 200-meter backstroke and handing Phelps his first loss of the U.S. Olympic swimming trials.

Amanda Beard also set a world record — bringing the total to five in the first six days of the trials — but 10-time medalist Jenny Thompson failed to claim a spot in the 100 freestyle.

Peirsol led all the way and pulled away on the final leg for a time of 1 minutes, 54.74 seconds — breaking his own mark of 1:55.15 set two years ago.

“I always like to win, but Peirsol is a great competitor. In five weeks, I guess we’ll figure out who’s No. 1 and who’s No. 2,” Phelps said.

Phelps took the second Olympic spot at 1:55.86. He’s entered six individual events at the trials, hoping to compete in up to nine races at the Athens Games.

Peirsol is a backstroker exclusively, having gone nearly four years since his last loss in the 200.

“I don’t ever want to lose my race,” he said. “I love that thing.”

Phelps returned just 28 minutes later to win the 200 individual medley. He was timed in 1:56.71 — 0.77 off his own world record.

Swimmer Aaron Peirsol celebrates his world-record finish in the men's 200-meter backstroke at the U.S. Olympic swim trials. Peirsol finished in a time of 1:54.74 on Monday in Long Beach, Calif. Phenom Michael Phelps, who has qualified in six Olympic events, was second in 1:55.86.

“I actually think I’m starting to warm up a little bit. I’m feeling better and better,” said Phelps, who finished the night scoring the second-fastest time in the 100 butterfly semifinals.

Phelps became the first American male to qualify for the Olympics in five individual events, and he’s claimed a spot in the 800 meter freestyle relay as well.

Beard dominated a 200 breaststroke field that included four other Olympians. She won by nearly five seconds at 2:22.44.