LOUISVILLE, Ky. -- I'll Have Another looked like just another horse at the Kentucky Derby.

Until the final furlong, that is.

That's when the chestnut colt -- sold for a paltry $11,000, ridden by a rookie jockey hardly anyone knew and stuck in an outside post -- blazed past highly regarded Bodemeister to win by 1½ lengths on Saturday, beating one of the deepest fields in years.

I'll Have Another stormed out of post No. 19 -- the first winner from there in 138 runnings of the Derby -- and bided his time back in mid-pack while Bodemeister set a blistering pace on a muggy, 85-degree afternoon at Churchill Downs.

"He's an amazing horse. I kept telling everybody, from the first time I met him, I knew he was the one. I knew he was good," jockey Mario Gutierrez said. "I said in an interview, even if they allowed me to pick from the whole rest of the field, I would have stayed with him, 100 percent, no doubt about it."

Making his Derby debut at 25, Gutierrez got his chance to ride I'll Have Another after trainer Doug O'Neill and owner J. Paul Reddam happened to see him at Santa Anita in Southern California.

"I don't know if he won or not, but he really looked good in the irons to me," said Reddam, who owns CashCall, a lending company in Anaheim, Calif. "I said, 'We need to try some new blood.' "

It was another chapter in Gutierrez's unusual route to the Derby winner's circle. He followed in his father's footsteps as a jockey, getting on quarterhorses in Veracruz, Mexico, at 14. After a stint in Canada, he eventually started getting noticed on the West Coast, especially after winning the Santa Anita Derby last month.

"Top trainers, top owners, of course, they're not going to know anything about me," he said.

Despite a rookie jockey, trainer Doug O'Neill, center, won the Kentucky Derby for the first time. Rob Carr/Getty Images

Still, Gutierrez was largely a mystery to the record crowd of 165,307, who didn't know 15-1 shot I'll Have Another or the jockey had the right stuff until the 20-horse field turned for home. That's when Gutierrez, who moved up between horses around the final turn, positioned his colt not far from the rail and set him down to run.

"I know my horse was reaching every single step of the way, but I wasn't going to stop riding until I was passing the wire," he said. "That is when the horse race is finished."

I'll Have Another overhauled a tiring Bodemeister to win by 1½ lengths. He paid $32.60, $13.80 and $9. He ran 1¼ miles in 2:01.83.

Bodemeister, trained by three-time Derby winner Bob Baffert, was second and returned $6.20 and $5.60 as the 4-1 favorite. Dullahan was a neck back in third and paid $7.20 to show.

O'Neill didn't waste any time vowing that I'll Have Another will go on to the Preakness in two weeks.

"Maryland, here we come, baby!" he said.

They'll go to Pimlico as one of the favorites as a result of I'll Have Another's Derby win and his catchy name. It has nothing to do with alcohol; it's Reddam's response to his wife's nightly query of "Do you want any more cookies?" as he lounges on the couch.