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Blake Baggett, #4, on course during the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 3, 2020.

Start of the the 450 Moto #1 during the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

Motocross fans enjoy the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

Chase Sexton, #23, on course during the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

Colorado pro motocross racer Eli Tomac at the finish line jump during the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park on Oct. 3, 2020. (Photo by Andy Cross/The Denver Post)

Professional motocross riders in the 250 class head down turn one at the start of the 250 Moto #1 during the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

Professional motocross rider in the 250 class, RJ Hampshire, #24, rounds turn three on course during a practice session for the Lucas Oil AMA Pro Motocross Championship at Thunder Valley Park Oct. 03, 2020.

Back of Colorado motocross racer Eli Tomac's helmet before the start of the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

The 250 class had across course during the 250 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

Professional motocross rider in the 250 class, Derek Drake, negotiates ruts on course during a practice session for the Lucas Oil AMA Pro Motocross Championship at Thunder Valley Park Oct. 03, 2020.

Dylan Ferrandis, #14, celebrates in the air crossing the finish line to win 250 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

Blake Baggett, #4, on course during the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 3, 2020.

Adam Cianciarulo, #9, mid-air on a jump at the finish line during the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020. Cianciarulo went on to win the race.

Chase Sexton, #23, on course during the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

Colorado motocross racer Eli Tomac puts on his helmet before the start of the 450 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park on Oct. 3, 2020. (Photo by Andy Cross/The Denver Post)

Shane McElrath #12 rides a rut on course during the 250 Moto #1 for the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020.

From left to right, motocross riders in the 250 class, Joseph Crown, #355, Jo Shimoda, #84, Dylan Ferrandis, #14, Mitchell Harrison, #74, RJ Hampshire, #24 and Shane McElrath #12 charge up the hill for the start of the 250 Moto #1 during the Lucas Oil AMA Pro Motocross Championship 2020 Thunder Valley National at Thunder Valley Park Oct. 03, 2020. Ferrandis went on to win the race.

Professional motocross riders in the 450 class, Grant Harlan #349, left, and Marvin Musquin #25, launch over the finish line jump during a practice session for the Lucas Oil AMA Pro Motocross Championship at Thunder Valley Park Oct. 03, 2020.

Professional 450 class motocross rider from Cortez Colorado, Eli Tomac, #1, power washes his boots after a practice session for the Lucas Oil AMA Pro Motocross Championship at Thunder Valley Park Oct. 03, 2020.

Professional motocross riders in the 450 class practice heading up the start line during a practice session for the Lucas Oil AMA Pro Motocross Championship at Thunder Valley Park Oct. 03, 2020.

Professional motocross riders round turn one during a practice session for the Lucas Oil AMA Pro Motocross Championship at Thunder Valley Park Oct. 03, 2020.

250 class motocross riders Derek Kelley, #227, left, and Shane McElrath #12, right, leap over a jump on course during a practice session during the Lucas Oil AMA Pro Motocross Championship at Thunder Valley Park Oct. 03, 2020.