Victor Espinoza was aboard for this second straight Derby win, and third overall.
The 5-2 favorite was in contention at the top of the stretch Saturday and pulled clear at the finish for his fifth win in six starts.
PHOTOS: Horses and hats at the 2015 Kentucky Derby
Hall of Fame trainer Bob Baffert got his fourth Derby win, and also sent out third-place finisher Dortmund.
Firing Line was second.
The time was 2:03.02 for the 1 1/4 miles. The largest Derby crowd ever - 170,513 - looked on under sunny skies.