Marc Marquez retained his perfect MotoGP record on American soil with a fourth successive victory at the Circuit of the Americas in Austin.
Ulsterman Eugene Laverty followed up his fourth-placed finish in Spain last weekend by coming home in 12th, which was enough to give him four world championship points.
Marquez dominated though. No other rider has won on that track since it became a part of the MotoGP calendar in 2013 and the Spaniard made it a perfect 10 wins from 10 in Moto2 and MotoGP races he has contested in the States by keeping his cool while some of his nearest challengers crashed out.
Valentino Rossi, who had trailed Repsol Team Honda rider Marquez by eight points after two races, went out in the third lap while Dani Pedrosa slid into the side of Andrea Dovizioso in an incident that would eventually lead to both men's retirements from the race.
Reigning world champion Jorge Lorenzo finished second behind his compatriot despite leading heading into turn one as Rossi's Movistar Yamaha MotoGP team-mate lost ground twice in the early stages when running wide at corners.
"I'm really happy, I think I did a very good race," said Marquez after extending his championship lead over Lorenzo to 21 points. "Everybody enjoyed the race; it was not very, very fun but we take 25 points and that was the most important."
British pair Cal Crutchlow and Bradley Smith were both unseated in quick succession at turn 11 on the eighth lap, with Smith's bike almost flying into Crutchlow's legs on the edge of the track. Both men were able to get back on but finished out of the points in 16th and 17th. Fellow Briton Scott Redding was sixth.