Marquez, who has sealed the 2019 crown with four races to spare, is now just two premier-class titles short of Giacomo Agostini and one short of .

Quartararo, who had been allowed extra RPM from his engine this weekend and qualified on pole for the fourth time, had maintained the lead off the line, while Marquez jumped Maverick Vinales immediately for second and saw off a challenge from the works Yamaha rider on the run down to Turn 3.

Marquez himself then slipstreamed past Quartararo on that straight on the second tour, only to get his braking wrong into Turn 3, running wide in the sweeping right-hander and only just keeping second place from Vinales.

By then Quartararo had managed to put some distance between himself and Marquez, with the gap reaching nearly seven tenths at one point, only for the championship leader to immediately start catching the rookie back up.

On lap 13, he was all over Quartararo once more, hounding him corner after corner as the race passed its halfway point.

He continued to put Quartararo under relentless pressure until lap 23, where he finally tried a move around the outside of Turn 3 but eventually conceded the corner to his rival.

But on the final lap Marquez overtook Quartararo using the slipstream even before the braking into Turn 3, and managed to get his stopped just in time to exit the corner ahead.

Quartararo stayed with Marquez over the rest of the lap and launched it down the inside of the man at the final corner, desperately trying to get his bike stopped and pull off a block pass, but running out just wide to allow Marquez a crucial cut-back move.

The pair were separated by 0.171s at the chequered flag, with Vinales completing the podium another second down.

Dovizioso finished fourth, some 11 seconds down on Marquez as he fought off the charging Suzuki of Alex Rins.

Danilo Petrucci settled for ninth in the second works Ducati, while Takaaki Nakagami completed the top 10 on the year-old LCR Honda.

Pramac Ducati rider Jack Miller was forced to surrender his sixth place on the grid and pull into the pitlane after at the start of the warm-up lap, but recovered to 14th after starting from the pitlane.

Race results

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