The horse, I'll Have Another, has surged past Bodemeister in the final furlong to win the Kentucky Derby.
The three-year-old colt gave jockey Mario Gutierrez a victory Saturday on his debut at Churchill Downs. The colt went off at 15-1 odds.
I'll Have Another, owned by J. Paul Reddam, finished the race in 2:01.83 in front of a record crowd of more than 165,000 people.
Bodemeister, which started as the 4-1 favorite, finished second after leading for most of the 2,000-meter race. Dullahan was third in the 20-horse field.
Union Rags, the favorite at 9-2 odds, came in seventh.
The Kentucky Derby is the first of the trio of races that make up the Triple Crown, along with the Preakness and Belmont Stakes.
Some information for this report was provided by AP.