Enzo Herzogenrath claimed victory in the first moto of the EMX85, creating a significant gap to his competitors under very challenging conditions.
Christian Amali finished second, 47 seconds behind the winner, with Jagger Townley taking third.
Lucas Leok, who had set the fastest time earlier in the morning, suffered mechanical issues and was left stranded on the starting gate, forced to watch as the rest of the riders headed into the first corner.