Marquez's title rival Andrea Dovizioso fell on the penultimate lap while trying to find a way past the Honda rider, allowing him to cruise home for his seventh title.
Dovizioso lost control and slid onto the grass as he tried to pass Marquez handing the Honda rider victory and the title.
Scott Redding apologised to Marc Marquez after putting his shoulder out congratulating the Spaniard on his latest title. Crutchlow had the pace through the race and was quick enough to battle with the race leaders. Riding in a flawless shape and rhythm and already at the end of the first lap I was second behind Dovi and I tried to study and analyse.More news: Ryanair faces backlash over racist incident on flight
"He was riding in a unusual way, sometimes pushing, sometimes slowed down, but then I had something more and I tried to give everything in the last four laps". "[But] I was disappointed because he deserves to be here too". I'm proud to share this milestone with him.
"I was pushing really hard and he did a mistake". "He's run a flawless season, with eight race wins, and his extraordinary consistency has seen him reach the podium in most races".
"I already imagined that it will be (decided) here but the important thing is that when you have the first chance, you do it". I then stood on the asphalt and my brother and Jose put it back in. its not the first time, maybe it was my weak point of the season, during the season I dislocated it many times training at home.
"Dovi had been a great opponent throughout the year and coming into this he was very, very fast". "In December I need to have a pit stop with Dr Mir and next season it will be ideal", explained Marquez.More news: Cardinals’ Patrick Peterson asks for a trade
Dovizioso, who was the championship runner-up to Marquez in 2017, will have to wait another year for a shot at his first MotoGP premier class title.
"I am so happy with the level we are now, to finish the season like this and to be really ready next year, more ready than this year".
"It is positive for next year but unfortunately today we couldn't finish in the way we wanted".
"I was able to follow Andrea, then I say OK, I will try to use the same strategy as Thailand, attack before the last lap because I felt like they had something", he said.More news: 1,000+ tips pour in to find missing 13-year-old Jayme Closs