LOUISVILLE, Ky. – Since the filly Regret did it in 1915, only two horses have won the Kentucky Derby having made just three previous starts. In 2018, Justify did it on his way to becoming the first undefeated Triple Crown winner since Seattle Slew in 1977. In 2008, Big Brown, also undefeated, won the Kentucky Derby from post 20, a spot the brash trainer Richard Dutrow Jr. picked on purpose.