The mile-high altitude of the greater Denver area provided the setting for Round 3 of the 2019 Lucas Oil Pro Motocross Championship, which made its annual visit to scenic Thunder Valley Motocross Park. The mountainside venue is one of the most challenging tracks in all of motocross, and riders are put to the test over the course of two motos.

In today's landscape of American motocross, starts are arguably more important than they've ever been before, and nothing feels better than capturing the MotoSport.com Holeshot. Starts are serious business, and grabbing the holeshot is the ultimate reward for a rider who took full advantage of his gate pick, reaction time, launch, upshifting, and clean entry and exit from the first turn.

See which riders secured the early edge in each moto of the 450 Class and 250 Class with the MotoSport.com Holeshot replays from Thunder Valley.