Diabolic is a 2019 filly by Dark Angel out of Seafront. She was purchased at the Goffs Orby Yearling sale by the D.J. Stable team. Diabolic is trained by Hall of Fame trainer Mark Casse.

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Diabolic broke her maiden on debut at Gulfstream Park on May 20th. She then moved up north to Woodbine in Toronto, Canada. She won her next race, which was her stakes debut, the My Dear at Woodbine.