Ian Crocker set a world record in the 50-meter butterfly and the United States avenged an earlier loss to Australia with a victory in the women's 400 freestyle relay at the World Short Course Championships on Sunday night.

The Americans won two of five finals, giving them 16 victories in 28 events so far. The meet ends Monday.

Crocker touched first in 22.71 seconds, lowering the mark of 22.74 set by Geoff Huegill of Australia at the 2002 championships in Berlin. It was the American's second gold medal in the temporary 25-meter pool.

Brooke Hanson of Australia won the 100 breaststroke and 200 individual medley, tying the record for most golds at a short-course championships with five. American Kaitlin Sandeno won four golds.

"I never thought it would be five gold medals. I'll go to bed a happy girl tonight," said Hanson, who has one event remaining Monday. "Anything can happen and I proved that."

Jenny Thompson anchored the victorious 400 freestyle relay in her final meet before retirement. Amanda Weir, Kara Lynn Joyce, Lindsay Benko and Thompson won in 3 minutes 35.07 seconds.

Thompson held off fast-closing Swede Therese Alshammar, whose 100 split of 53.20 was quicker than Thompson's 53.75. Australian anchor Shayne Reese swam 53.82 over the final 100.

"I'm so honored to be a part of this race, especially to swim with Jenny in her last relay race. She's been such an inspiration to us all," said Benko, who handed off a slight lead to Thompson. "We had a lot of confidence with Jenny anchoring our team."

Sweden was second in 3:35.83 and the Australians were third in 3:36.18.

Thompson and Joyce were on the 400 medley relay team that finished second to Australia's world record time in a thrilling final Saturday.

Crocker turned and checked the scoreboard, then raised both arms, acknowledging the cheers of 8,421 fans at Conseco Fieldhouse.

Crocker won a gold medal at the Athens Olympics after Michael Phelps gave up his spot in the 400 medley relay final so Crocker could make up for a poor swim in an earlier race. Crocker swam the fly leg and helped the Americans to a world record. Phelps shared the gold, too, after swimming in the preliminaries.

Phelps won the 200 freestyle at this meet before withdrawing Friday because of a back injury.

Crocker dropped out of the 100 butterfly preliminaries Sunday morning to conserve energy for the record he wanted to set in the evening. The effort was worth $15,000 from FINA, the sport's international governing body.

"I really wanted to walk away from this meet with a world record," he said. "I knew and the coaches knew there was a chance for the world record, so why not go get it?"

Crocker, a 22-year-old from Portland, Maine, won the 100 butterfly Friday.

Mark Foster of Britain, who at 34 was at least six years older than the rest of the field, earned silver in 23.22. Duje Draganja of Croatia took bronze in 23.26. Matt Welsh of Australia, who finished second, was disqualified for staying under water too long on the start.

Crocker's mark was the second world record of the meet. Australia won the women's 400 medley relay in world record time Saturday.

Hanson defeated teammate Jade Edmistone to win the 100 breaststroke in a meet record of 1:05.36. The Australian duo also finished 1-2 in the 50 breaststroke.

U.S. Olympians Tara Kirk and Amanda Beard were third and fourth, respectively.

Hanson returned 11/2 hours later to win the 200 IM in 2:09.81. Lara Carroll of Australia took silver in 2:10.58. Katie Hoff, a 15-year-old Olympian from Baltimore, was third in 2:10.61. Beard was fourth.

Ian Crocker of the U.S. gets started in his world record-setting 50-meter butterfly time of 22.71 seconds at the World Short Course Championships.