Starting from second, Mir took the lead at Turn 1, and a leading group of five riders also including Fenati, Ramirez, Nicolo Bulega and Tony Arbolino soon formed.

The first eight laps saw Mir, Fenati and Ramirez constantly rotate the top three positions among themselves before the championship leader managed to keep the lead for several laps.

Fenati soon restarted the battle and took the lead, but Mir managed to fight back every time the Italian found a way past.

Still, the Italian started the final lap in the lead and, even though he kept his advantage at the first turn and even pulled a small gap out over Mir and Ramirez.

But Leopard Racing rider Mir made his move at the penultimate corner to seal his fifth win in nine races, beating Fenati to the line by 0.121s.

Ramirez completed the podium less than a tenth further back, the Platinum Bay KTM rider celebrating his maiden top three finish.

Sky Racing VR46's Bulega took fourth, as he and Arbolino lost ground towards the end of the race. The latter failed to finish the race after a highside crash at Turn 9.

Philipp Oettl (Schedl GP) distanced himself from the second group to secure fifth, with Enea Bastianini (Estrella Galicia) taking sixth.

Mir's Leopard teammate Livio Loi was seventh, ahead of KTM Ajo's Bo Bendsneyder, SIC58 Squadra Corse's Tatsuki Suzuki and the second Platinum Bay bike of Darryn Binder.

Pole-sitter Aron Canet (Estrella Galicia) was unable to keep up with the leaders and soon dropped outside of the top 10 before crashing at Turn 11.

British duo John McPhee and Danny Kent, standing in for injured KTM rider Niccolo Antonelli, both crashed out, as did Gabriel Rodrigo.

Race results:

Cla	#	Rider	Bike	Time/Gap
1	36	Joan Mir	Honda	39'34.775
2	5	Romano Fenati	Honda	0.121
3	42	Marcos Ramírez	KTM	0.218
4	8	Nicolo Bulega	KTM	5.074
5	65	Philipp Ottl	KTM	13.073
6	33	Enea Bastianini	Honda	13.650
7	11	Livio Loi	Honda	14.318
8	64	Bo Bendsneyder	KTM	14.466
9	24	Tatsuki Suzuki	Honda	14.583
10	40	Darryn Binder	KTM	14.666
11	21	Fabio Di Giannantonio	Honda	15.438
12	58	Juan Francisco Guevara	KTM	16.146
13	7	Adam Norrodin	Honda	16.234
14	95	Jules Danilo	Honda	16.324
15	12	Marco Bezzecchi	Mahindra	17.603
16	16	Andrea Migno	KTM	17.752
17	71	Ayumu Sasaki	Honda	17.845
18	84	Jakub Kornfeil	Peugeot	17.863
19	48	Lorenzo Dalla Porta	Mahindra	40.054
20	96	Manuel Pagliani	Mahindra	40.254
21	27	Kaito Toba	Honda	40.521
22	31	Raul Fernandez	Mahindra	1'09.377
23	41	Nakarin Atiratphuvapat	Honda	1'09.466
24	77	Tim Georgi	KTM	1'09.590
25	4	Patrik Pulkkinen	Peugeot	1'13.004
26	6	Maria Herrera	KTM	2 laps
Ret	19	Gabriel Rodrigo	KTM	1 lap
Ret	14	Tony Arbolino	Honda	8 laps
Ret	44	Aron Canet	Honda	12 laps
Ret	52	Danny Kent	KTM	12 laps
Ret	17	John McPhee	Honda	21 laps