Relive the high-speed action from Supercross Round 15 in Philadelphia, Pennsylvania which also featured the 250 East Region race. #NBCSports #Supercross #SuperMotocross » Subscribe to Motorsports on NBC: https://www.youtube.com/motorsportsonnbc?sub_confirmation=1 » Get the latest motorsports news on NBC Sports: https://www.nbcsports.com/motors »…
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