The upset ended Borel's bid to become the first jockey to win a personal Triple Crown, and he failed to deliver on a guarantee that he would capture the Belmont with the little gelding. Borel won the Kentucky Derby aboard Mine That Bird, then won the Preakness with the filly Rachel Alexandra.

Summer Bird, sent off at 11-1 odds, blew past Dunkirk and Mine That Bird to give jockey Kent Desormeaux a Belmont Stakes victory he desperately wanted.

Mine That Bird made a huge move outside and took a brief lead over Dunkirk.

But it was Summer Bird who pulled away for a 2 3/4-length victory over Dunkirk. Mine That Bird was third in the field of 10 3-year-olds.

"I thought I was home free," Borel said, "but the other horses galloped by."

There wasn't any happier rider than Desormeaux.

Last year, he won the Derby and Preakness aboard Big Brown, only to have to pull up the colt in the Belmont. And in 1998, he brought Real Quiet into the Belmont for a Triple try only to get beat by Victory Gallop by a nose in a heartbreaking defeat.

"I hope from now on we'll talk about winning one," Desormeaux said.

There was an inquiry filed by Charitable Man's jockey Alan Garcia against Dunkirk for interference, but it was disallowed by the racing stewards.

Charitable Man was fourth, followed by Luv Gov, Flying Private, Brave Victory, Mr. Hot Stuff, Chocolate Candy and Miner's Escape.

The winning time for the 11/2 miles was 2:27.54