Marc Marquez wins as rivals crash out

Honda rider Marquez now has a healthy advantage of 36 points at the head of the table following a victory that looked in little doubt after his two main rivals dropped out of the running.

Marquez slumped to sixth at the start of a tough opening lap, as Jorge Lorenzo vaulted from sixth on the grid into an early lead over poleman Zarco and Dovizioso.

By the end of the second lap, Marquez was up to fourth, joining a four-rider lead group.

Dovizioso picked off home favourite Zarco for second place at the downhill La Chapelle right-hander on the third lap, and he passed Lorenzo to take the lead at the start of lap five.

But as the lead group plunged into La Chapelle once more, Dovizioso lost the front end of his factory Ducati and slid into the gravel, his second retirement in as many races.

Three laps later, while defending second from Marquez, Zarco suffered a similar fate to Dovizioso as he fell at the Garage Vert double right-hander, ending his hopes of a maiden MotoGP win.

That left Lorenzo with a narrow lead over Marquez, but it was clear Marquez had superior pace to the sole remaining works Ducati, and the inevitable pass came at La Chapelle on lap 10.

Danilo Petrucci, promoted to third by the incidents for Dovizioso and Zarco, managed to follow Marquez past Lorenzo on the next lap at the Musee left-hander, but couldn't mount a challenge for the lead.

Marquez was able to reel off the remaining laps and claim victory by a final margin of 2.310 seconds.

After being passed by Petrucci's Pramac Ducati, Lorenzo couldn't stave off Yamaha's Valentino Rossi, who moved ahead at La Chapelle to claim his first podium finish since the Qatar opener in third place.

Lorenzo then surrendered further places to the second Pramac Ducati of Jack Miller and Dani Pedrosa on the second works Honda, ending up sixth, 10 seconds down on Marquez.

Maverick Vinales ran as low as 13th in the early laps but managed to recover to seventh, a further 13 seconds back, while Cal Crutchlow passed Aleix Espargaro on the last lap to grab eighth after his huge qualifying crash left him in doubt for the race.

Completing the top 10 was the remaining Suzuki of Alex Rins, whose team-mate Andrea Iannone crashed out on the opening lap at La Chapelle.

Pol Espargaro led the KTM charge in 11th, while top rookie Hafizh Syahrin, Franco Morbidelli, Bradley Smith and Takaaki Nakagami rounded off the scorers.

The other riders to crash were Scott Redding, Tito Rabat and Alvaro Bautista.