Jockey Mario Gutierrez rides I'll Have Another past Bodemeister ridden by Mike Smith (6) to victory Saturday in the 138th Kentucky Derby horse race at Churchill Downs.

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 1 1-2 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.’”