Pramac Racing's Jorge Martin has fended off Suzuki's world champion Joan Mir to seal his first MotoGP win at the Styrian Grand Prix but Jack Miller's Championship hopes have taken another damaging blow with a second straight crash.

Sunday's dramatic race at the Spielberg arena in Austria was held up for half an hour following a dramatic crash which ended with a bike being engulfed in flames.

Ducati pole-sitter Martin faced immense pressure from Mir but finished 1.548 seconds ahead of the Suzuki rider to hand Pramac their maiden MotoGP win in his rookie season.

Yamaha's world championship leader Fabio Quartararo completed the podium, extending his lead to 40 points over nearest rival Johann Zarco of Pramac, who finished sixth.

Australian Miller was lying fourth and challenging to move into the podium places when he slid off the track into the gravel with 10 laps left.

It was the second straight race that the man from Townsville had failed to finish and it could do fatal damage to his fading Championship hopes as he's now 72 points behind Quartararo in fifth place.

Race winner Martin, though, was left ecstatic. "I cannot believe it," he said. "What I did today was amazing. I kept a constant pace during the race and was super focused. Even if I did some mistakes, my target was to win.

"Joan was impressive today. He was behind me almost all the race, but the last laps I tried harder even when the front tyre was destroyed.

"Today is one big step for my big dream of being a world champion."

Earlier, the race had been red-flagged on the third lap after KTM's Dani Pedrosa fell on the exit of Turn 3 and Aprilia Racing's Lorenzo Savadori struck the Spaniard's fallen bike.

The crash caused a fire on track but Pedrosa was able to walk away unhurt from the incident and finished 10th in his first MotoGP race since 2018, while Savadori did not return for the restart.

KTM's Brad Binder made a stunning charge from 16th on the grid to finish fourth, while Honda's six-times premier-class winner Marc Marquez came eighth.

Italian great Valentino Rossi, who announced on Thursday he will retire at the end of the season, was 13th on his Petronas Yamaha.