Jorge Martin was fast out of the blocks in the Feature Race, getting his elbows out and carving his way through the field before taking the lead late on and never looking back to win by 0.477 secs.
He was joined on the podium by Ai Ogura in third.
Fabio Di Giannantonio finished fourth, Pedro Acosta fifth, Fabio Quartararo sixth, Enea Bastianini seventh, and Raul Fernandez eighth; all Alpinestars riders.