FAYETTEVILLE -- With his gold necklace clinched tightly between his teeth like a bridle in the mouth of the Kentucky Derby favorite, Wallace Spearmon Jr. felt sensational pain through all 300 meters in his attempt to break Robson da Silva's indoor world record.

Spearmon's charge over the final 25 meters and his will to hold off the competition gave him his first world record, shattering the previous mark (32.19) by more than three tenths of a second in front of 3,924 fans inside the Randal Tyson Track Center.

Spearmon, a former Arkansas Razorback phenom in the 200 where he holds the indoor American record, won the race in 31.88 beating indoor 400 world record holder Kerron Clement and LaShawn Merritt (31.93). Omar Brown, also a former Razorback, finished fourth in 33.20.

"I wanted to start out strong and eat up the field," said Spearmon, who started out of lane four. "I'm hurting right now. I can't even stand up."

The win gave Spearmon yet another thrilling accomplishment in front of the hometown crowd at the Randal Tyson Track Center and a $25,000 check from Tyson Foods Inc. chairman and chief executive officer John Tyson.

"My name is in the books. Hopefully, I can come back tomorrow and get my name in the books again," Spearmon said.

Spearmon will run again this afternoon in an attempt to break the 4x400 relay record with fellow Americans Darold Williamson, Jeremy Warner and Clement. The current 4x400 world indoor record is 3:02.83 by the U.S. National Team on March 7, 1999.

Spearmon's world mark on Friday is the second world record currently held by an athlete running at the Tyson Center.

It was a great Tyson Invitational for former Razorback sprinters.

Four-time Olympic medalist Veronica Campbell (Jamaica) matched the world-best time in the women's 60, beating Americans Me'Lisa Barber and Lauryn Williams in 7.04, also a Tyson Center record. Barber ran 7.10 and Williams finished in 7.16.

Reigning World Athletics Final 200 champion Tyson Gay finished second to American Terrence Trammell by .004 of a second. Trammel crossed the line in 6.56. Gay was credited with the same time. Both are the best times by an American this year.

Gay blamed his race on a slow start something he and coach Lance Brauman, who also coaches Spearmon, had been working extensively on leading into Friday's race.

"I'm pleased with the race," Gay said. "Last week (in New York) was sluggish for me. If I was running somewhere else I would have ran slower, but when I get in this house and the fans are around me it gets the adrenaline pumping and I run better."

In the men's 400, American Bershawn Jackson ran the fastest time in the world this year with a time of 46.00.

Jackson edged the Bahamas' Chris Brown (46.03). The two both topped Alleyne Francique (Grenada), who ran 46.19 -- the previous world best mark -- in New York last week.

"They came through 20.08, that's just stupid fast," Johnson said about the first 200 meters of the race. "But, I stuck to my game plan and executed."

Amy Acuff, a five-time U.S. Outdoor champion, won the women's high jump with a height of 6-4 3/4. She improved her seasonal best by five centimeters and now holds the ninth-best jump in the world this year.

Chaunte Howard, who entered the event with the No. 3 ranking in the world and the top ranked American finished third (6-1 1/4) behind Gwen Wentland (USA) in second at the same height.

Kenya's Boaz Cheboiywo ran the second-fastest 3,000 meters in the world this year with a 7:35.65. After winning the race he jogged a victory lap clapping with his hands over his head, thanking the crowd.

American Adam Goucher was second with the fastest time by an American this season (7:41.59) and Kevin Sullivan set a Canadian National record with a 7:42.17.

American pole vaulter Jeff Hartwig won the vault with a height of 18-8 1/4. Hartwig continues to hold the best vault by an American this year. He attempted to clear 19 feet, but could not vault over the bar. If he would have cleared the height, it would have been his 100th time over 19 feet in his career.

American Jason Lunn ran the second-fastest mile in the world this year with a winning mark of 3:55.87.