Martin triggered a pile-up into Turn 1 on the opening lap when he made contact with Yamaha’s Fabio Quartararo trying to overtake him on the inside.
Quartararo was forced into a collision with Aprilia’s Maverick Vinales, who dropped from second after a bad start, which then led to himself, the Yamaha rider and Ducati’s Enea Bastianini running off track while Miguel Oliveira, Marco Bezzecchi and Johann Zarco were all taken down.
