Kieren Fallon's mount Kris Kin produced a brilliant late surge to win the 2003 Vodafone Derby at Epsom.
Kris Kin proved strong enough to fend off The Great Gatsby, ridden by Pat Eddery, who had led from the off but faded over the last two furlongs.
One of the pre-race favourite Alamshar also finished strongly to take third place.
Kris Kin, trained by Sir Michael Stoute, had drifted as far as 14-1 ahead of the race, but shortened to 6-1 and justified the punters' faith.
"Everything went his way and he travelled good in his race. They went a good gallop and he was able to quicken," Fallon told BBC Sport after the race.
"It got a bit tight at the top of the hill as it always does when they cross over. I worried there but I let him find himself and he was OK."
The Great Gatsby made the early running under Eddery, along with Dutch Gold.
Refuse To Bend, the 11-4 favourite, was racing in touch with Brian Boru close up on the inside and Kris Kin in mid-division.
As the field turned for home Eddery kicked on and had most of the runners in trouble, but Fallon had the move covered and went in pursuit of the leader.
His mount answered all his calls to lead inside the final furlong and hold his rivals at bay in a stirring finish to land a massive public gamble.
Alamshar threatened briefly a furlong out and was only a short head behind the second, while Norse Dancer had been last at the top of the hill and made up an amazing amount of ground to claim fourth place.
Kris Kin and Norse Dancer had been supplemented for the race at a cost of £90,000 on Monday.
Winning trainer Sir Michael Stoute landed his third Derby following the victories of Shergar in 1981 and Shahrastani five years later.
It was Fallon's second blue riband after Oath's success in 1999.
Stoute said: "It's always a great thrill. You can't win it too many times and 1986 was a long time ago.
"We've had a little bit of misfortune over the years since that period so I am delighted that it has come good.
"I am delighted for Saeed Suhail (owner) who was tough enough to supplement him. You've got one of the great rides round Epsom on Derby day from Kieren Fallon - and that helped."
Some £20m was gambled on the race, and bookmakers were pleased none of the three market leaders won, but the support for Kris Kin left them with mixed feelings.
Corals spokesman Simon Clare said five-time champion Fallon had now replaced Frankie Dettori as the number one punter's pal.
Meanwhile, Dettori will have to wait for another year to claim an elusive first win in the Derby. His mount Graikos was his 11th loser in the Classic.
1st: Kris Kin (K Fallon) 6-1
2nd: The Great Gatsby (P Eddery) 20-1
3rd: Alamshar (J Murtagh) 4-1
4th: Norse Dancer (T Quinn) 16-1