Danny Kent honoured his pre-race promise, pulling away at the front as he imagined would be possible to earn a dominant win in the Moto3 race at an overcast and damp Circuit of the Americas.

A poor start from pole had initially seen Miguel Oilveira lead an ever-changing front group, but as soon as the Leopard Racing rider hit the front on his Honda with 14 laps to go after studying the damp parts of the track and planning his charge, he began to gap his rivals.

The Briton finished a huge 8.532 seconds ahead of the pack after a supreme performance in Austin to take an early championship lead.

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With Kent in a class of his own, the battle for second was a furious fight between youth and experience, all coming down to the final corner where Estrella Galicia rookie Fabio Quartararo kept his head and timed his run to the line for his first Moto3 podium finish.

The all-Honda podium was completed by Kent's team-mate, the experienced Efren Vazquez, who battled his way up to the lead fight from a 16th place grid start.

Enea Bastianini just missed out on the podium in the battle to the line, but his fourth builds well on a strong start, which saw the Gresini rider take second in Qatar.

Red Bull KTM Ajo rider Brad Binder was the first non-Honda rider to take the flag in fifth but over four seconds ahead of the next rider on track, with John McPhee solo for sixth for Saxoprint RTG, a success after a tough weekend for the British rider in Texas.

Gresini's Andrea Locatelli was lucky to finish in the points taking seventh after battling to the front of the next group on track after nearly falling foul of Miguel Oliveira's front-end crash, his wits and skill keeping him out of the path of the KTM as it came back across the track.

Locatelli held off fellow Italian Romano Fenati (Sky Racing Team VR46) to the line with Isaac Vinales on the Husqvarna and Karel Hanika (Red Bull KTM Ajo) also involved in the same battle, finishing in ninth and tenth respectively.

Drive M7 SIC rider Jakub Kornfeil was next to cross the stripe in 11th, with Andrea Migno (Sky Racing Team VR46) 12th and Philipp Oettl 13th for Schedl GP Racing.

Niki Ajo fell in the closing laps but still managed to hold on for 14th for RBA Racing, while Matteo Ferrari took the final point on offer for San Carlo Team Italia.

Alexis Masbou crashed out on the final corner of the final lap in a last ditch attempt for second, losing the championship lead as his points tally fell with every passing rider as he attempted to push his Honda over the line for points to just miss out in 16th.

Early crashes ended the hopes of Juanfran Guevara and Livio Loi, and Jorge Martin retired his Mahindra soon after.

Niccolo Antonelli crashed out of the leading group around the halfway mark, skipping over Hiroki Ono's Leopard racing Honda when he also fell at turn 11 on the same lap.

There was another tandem crash at turn 11 just two laps later when Francesco Bagnaia narrowly beat Jorge Navarro to the gravel at the same turn.

Zulfahmi Khairuddin fell late in the race.