Hit It A Bomb was ridden to victory by England's Ryan Moore in the Breeders' Cup Juvenile Turf at Keeneland, Kentucky.
The Aidan O'Brien-trained colt finished strongly to beat Airoforce into second and Birchwood into third.
It extends the son of War Front's unbeaten record to three and gives O'Brien his third win in the race.
The Ballydoyle trainer said: "He's a classy miler and we will be looking at the Classics next year."
In his third start, the Kentucky-bred Hit It A Bomb improved his perfect record under three-time former British champion Moore by a neck over Airoforce to be Europe's only winner of the day.
|BBC Horse Racing correspondent Cornelius Lysaght|
|"That was magnificent by Ryan Moore on the still-unbeaten Hit It A Bomb, putting the Irish colt's nose in front as the finishing line loomed. Moore, again demonstrating why he is as sought-after a jockey as there is in the world, ensured they overcame an unfavourably wide draw, accelerating from a fairly unpromising looking last place to first.|
|A winner on turf and on a synthetic surface, and now on both sides of the Atlantic, Hit It A Bomb looks a very exciting prospect."|
The $1m (£650,000), one-mile race on Keeneland's turf track was one of four on the opening day of the festival.
Moore rode O'Brien's Alice Springs to second behind Catch A Glimpse in the Juvenile Fillies Turf.
A historic finale for Golden Horn?
Golden Horn, ridden by Frankie Dettori, will bid to become the first horse in history to win the Epsom Derby, the Prix de l'Arc de Triomphe and the Breeders' Cup Turf in the same year on Saturday.
The Cape Cross colt will line up at Keeneland looking to end his career in style.
Owner-breeder Anthony Oppenheimer said: "I'm not feeling nervous. Whatever happens, it's his last run and it is tremendously exciting. Everyone is very pleased with him, particularly Mr Dettori."
The O'Brien-trained Found was just a length behind Golden Horn in the Irish Champion Stakes in September.
And the daughter of Galileo finished runner-up in the Champion Stakes at Ascot last time out.
Golden Horn and Found are the only European challengers in a 12-strong field.
The home team includes Arlington Million hero The Pizza Man and multiple Group One winner Big Blue Kitten.
The 13-race event will be capped on Saturday by Triple Crown winner American Pharoah's bid for the $5m Classic.