
Mir took advantage of title rival Fabio Quartararo’s first-lap crash while compatriot Alex Rins ensured a one-two finish for Suzuki, the first for the Japanese manufacturer since 1982.
Frenchman Quartararo recovered to trail home in 14th but saw his championship hopes suffer a huge blow. He is level on 125 points with Rins after losing considerable ground on Mir, who is top on 162.
“I’m super happy. I was missing a victory and it came at the perfect moment,” said the 23-year-old Mir, the Moto3 champion in 2017.
Pol Espargaro of KTM, who started the race on pole, came third ahead of Japan’s Takaaki Nakagami of the Honda-LCR team.