Reigning Red Bull Rookies winner Oncu lined for his first Moto3 wildcard look and acquired a position running behind pole-sitter Arbolino and also the Bezzecchi.
The first stages of the race saw riders crash, such as Tatsuki Suzuki collecting Lorenzo Dalla Porta and Aron Canet about the lap, and also the deck was shortly hit on by Bezzecchi .
Arbolino built a gap that was safe over Oncu, who pulled away from John McPhee, the Briton shortly falling from Fabio Di Giannantonio and Jorge Martin’s charging Gresini duo.
Drama ensued when Arbolino’s comfy run to his win ended with an accident on lap 11 at spin 4, providing an outcome of six seconds to Oncu.
Oncu, who’ll make his full-time series debut next year with all the Ajo KTM squad, managed to extend his lead though his gap was halved after a near-crash frighten on the last lap at Turn 6 and he finally won by 4.0s.
Di Giannantonio fell from McPhee and Martin finishing the podium and started to struggle.
Jakub Kornfeil held in the first half of the race but couldn’t keep up with the top five and by the time Enea Bastianini discovered his way he was 10 seconds adrift.
Bastianini occurred fifth thanks to Arbolino’s crash, followed by Jaume Masia, that became the leading rookie of 2018.
Niccolo Antonelli finished , with Nakarin Atiratphuvapat settling for eighth but still securing his very best finish of his profession that was Moto3.
The top 10 was completed Celestino Vietti and by Marcos Ramirez.
Suzuki, Canet, the Alonso Lopez, Dennis Foggia, Kaito Toba, Albert Arenas, Izam Ikmal, Arbolino, Phillipp Oettl and Vicente Perez failed to finish.
Bezzecchi recovered only to collapse back, but still took the chequered flag alongside Kornfeil Binder and Dalla Porta, all of whom were able to continue after crashes.