LOUISVILLE, Ky. — Maximum Security became the first winner disqualified for interference in the Kentucky Derby, leading to an agonizing wait and an eventual stunning reversal that made 65-1 shot Country House the winner Saturday.

Country House finished second in the slop before an objection was raised, causing a lengthy delay while stewards repeatedly reviewed several angles of video footage, before he was elevated into the winner's circle.

That gave Hall of Fame trainer Bill Mott his first Derby victory at age 65.

"It's bittersweet. You always want to win with a clean trip and have everybody recognize the horse as the very good horse and great athlete that he is," Mott said. "Due to the disqualification, I think some of that is diminished."

Jockey Flavien Prat, who originated the claim of foul, also won his first Derby.

"I'm kind of speechless right now," Prat said, letting out a long sigh.

Country House paid $132.40 to win — the second-highest payout in the Derby's 145-year history.

"Looking at the toteboard there's probably a lot of people that didn't think we could win," Mott said, "but that's horse racing."