The 3-year-old British-bred colt remained undefeated from three races with his Derby romp over 150-to-1 longshot Hoo Ya Mal.
Epsom Derby
Saturday's Group 1 Cazoo Derby at Epsom Downs in England has attracted a field of 17 3-year-olds.
Kirby lost the mount on John Leeper days before the English classic but won the race anyway on an improving son of Frankel.
English classic likely to be run on firm ground and eight-time Derby winner Aidan O'Brien has a strong hand again.
The 242nd running of the most famous Derby in Europe will allow 4,000 fans at Epsom Downs in Surrey on June 5.
