Pramac Ducati rider Martin overhauled poleman and championship leader Francesco Bagnaia on lap four of 13 and instantly put eight tenths between them.
As Bagnaia squabbled with Marc Marquez, Martin eased into the distance and took the chequered flag 1.8 seconds clear of KTM’s Brad Binder.
Bagnaia completed the podium after fending off VR46’s Luca Marini, with Marquez fifth on his racing return from injury.
Off the line, Bagnaia got his factory Ducati into the Dunlop chicane first ahead of Martin, Jack Miller, Marini and Marquez – who slumped from second on the grid.
Marquez quickly disposed of Marini into Turn 7 to move up to fourth as the leading five quickly pulled away from the chasing pack.
Miller crashed out of the race on lap two when he lost the front of his KTM at Turn 7, promoting Marquez up to third.
At the same time, Binder put a hard move on Marini into Turn 8 to take fourth away from the Italian.
Source: Autosport