Victor Espinoza, a three-time winner of the Kentucky Derby, will go for his fourth when he climbs aboard Bolt d'Oro in this year's running.

Mick Ruis, the trainer and owner of Bolt d'Oro, made it official late Monday, informing Espinoza's agent, Brian Beach, that Espinoza would indeed have the mount. Espinoza had been thought to be the front-runner to inherit the mount if Javier Castellano defected, which happened earlier Monday. Espinoza has worked Bolt d'Oro in recent weeks, but will be riding him in a race for the first time in the Kentucky Derby.

Espinoza has won the Kentucky Derby with War Emblem, California Chrome, and Triple Crown winner American Pharoah.

Castellano rode Bolt d'Oro in his last two starts, but on Monday opted to ride Audible in the Derby.