Onboard: Levi Newby - 2017 Mammoth Motocross 1

Two of the hottest amateur prospects in the country go bar to bar on the last day of racing at Mammoth Motocross: Bar-X Motorsports Broc Papi vs. Thunder Funding-backed Levi Newby. Find out what happens in one of the best amateur battles of the 2017 amateur national motocross season!