The entire day was under the threat of rain and Moto3 got the race day proceedings under way at the Circuit of the Americas in style.
After showing his worth on an under performing Honda in 2013, Red Bull KTM Ajo rider Jack Miller was in his element with his new machinery and scored back-to-back wins taking the top step in Texas after having managed the same feat in Qatar.
He became the first Australian to achieve this feat in the junior MotoGP class after becoming the first Australian to qualify on pole in 125cc/Moto3 since Casey Stoner in 2004 with a commanding performance over his rivals.
Miller lead for most of the race before some excellent blocking and braking saw him hold the lead over a tight final few corners.
Second went to a determined and fast Romano Fenati, the Sky Racing VR46 rider also using his brakes to good effect on the final few laps after catching the leaders.
Efren Vazquez was in the mix all race and held on to claim the final spot on the podium after a spirited performance from the class veteran.
Alex Marquez looked certain of fourth at least before falling at the final corner on the last lap, giving the position to his team-mate Alex Rins.
Team Calvo’s Jakub Kornfeil equalled his best finish to date in fifth and was followed across the finish line by Alexis Masbou in sixth and Francesco Bagnaia in seventh.
The Brits Danny Kent and John McPhee remained stuck together as they had been during qualifying and finished in eighth and ninth, top rookie Karel Hanika was also tangled up in their private race and crossed the line in tenth.
The remaining points went to Juanfran Guevara in 11th, a speedy Livio Loi in 12th for Marc VDS, Enea Bastianini taking his first championship points in 14th with Niklas Ajo in 14th aboard the second Husqvarna and Mahindra rider Miguel Oliveira battling to the final point.
Moto2 then kicked off with a massive crash, involving Josh Herrin, Nico Terol, Sam Lowes, Axel Pons and Luis Salom.
|Vinales dominated in Moto2 Photo: Pons HP40
A separate incident then saw Caterham’s Johann Zarco take out Julian Simon, a frontrunner at the time.
This left Belgian Xavier Simeon up front with Dominique Aegerter and Maverick Vinales. When Simeon went straight on after an error before eventually crashing out, Pons rider Maverick Vinales made the most of his opportunity and seized the lead.
The Moto3 champion then, in only his second race in the class, saw his opportunity and pulled away to win by am impressive margin of +4.009, building on his excellent Qatar debut performance where he climbed up to fourth.
Tito Rabat recovered to push on from fifth to an eventual second, though the Marc VDS man could only shake his head to the margin of victory Vinales held.
Dominique Aegerter held on at the front to complete the podium, his third time being in third place in his Moto2 career.
With the leading three well clear out in front Mika Kallio found himself to be the best of the rest while managing a returning shoulder injury in fourth.
Simone Corsi filled fifth spot on his Forward KLX as a flying Tom Luthi made up places in the final laps to nab sixth aboard his Interwetten bike.
Top Speed Up Ant West scored seventh, holding off Alex DeAngelis in eighth and the Tech 3 impressively steered into ninth by Marcel Schrotter. His team-mate Ricky Cardus, sitting in for Alex Marinelarena was just one palce behind in tenth.
Taka Nakagami struggled to eleventh after being disqualified in Qatar. Mattia Pasini followed him over the line in twelfth.
Randy Krummenacher finished 13thahead of German rider Sandro Cortese in 14th . The final point went to Malaysian rider Hafizh Syahrin.
Though he found himself in the middle of the opening tangle Sam Lowes recovered to place 16thfor Speed up, fellow Brit Gino Rea had arm pump and despite a strong start fell down the order to a final 25th.
Moto3 Austin Race Result Top 15:
1. Jack Miller Red Bull KTM Ajo (KTM) 41m 6.659
2. Romano Fenati SKY Racing Team VR46 (KTM) 41m 6.728
3. Efren Vazquez SaxoPrint-RTG (Honda) 41m 6.831
4. Alex Rins Estrella Galicia 0,0 (Honda) 41m 13.841
5. Jakub Kornfeil Calvo Team (KTM) 41m 13.923
6. Alexis Masbou Ongetta-Rivacold (Honda) 41m 26.766
7. Francesco Bagnaia SKY Racing Team VR46 (KTM) 41m 27.040
8. Danny Kent Red Bull Husqvarna Ajo (Husqvarna) 41m 30.640
9. John McPhee SaxoPrint-RTG (Honda) 41m 30.691
10. Karel Hanika Red Bull KTM Ajo (KTM) 41m 30.881
11. Juanfran Guevara Mapfre Aspar Team Moto3 (Kalex-KTM) 41m 31.476
12. Livio Loi Marc VDS Racing Team (Kalex-KTM) 41m 41.293
13. Enea Bastianini Junior Team Go&FUN Moto3 (KTM) 41m 41.614
14. Niklas Ajo Avant Tecno Husqvarna Ajo (Husqvarna) 41m 41.679
15. Miguel Oliveira Mahindra Racing (Mahindra) 41m 42.095
Moto2 Austin Race Result Top 15:
1. Maverick Viñales Pons HP 40 (Kalex) 41m 31.520
2. Esteve Rabat Marc VDS Racing Team (Kalex) 41m 35.529
3. Dominique Aegerter Technomag carXpert (Suter) 41m 38.843
4. Mika Kallio Marc VDS Racing Team (Kalex) 41m 40.110
5. Simone Corsi NGM Forward Racing (Forward KLX) 41m 41.454
6. Thomas Luthi Interwetten Paddock Moto2 (Suter) 41m 48.507
7. Anthony West QMMF Racing Team (Speed Up) 41m 49.081
8. Alex De Angelis Tasca Racing Moto2 (Suter) 41m 50.468
9. Marcel Schrotter Tech 3 (Tech 3) 41m 51.240
10. Ricard Cardus Tech 3 (Tech 3) 41m 56.072
11. Takaaki Nakagami Idemitsu Honda Team Asia (Kalex) 41m 59.983
12. Mattia Pasini Forward Racing (Forward KLX) 42m 15.475
13. Randy Krummenacher SWI IodaRacing Project (Suter) 42m 15.864
14. Sandro Cortese Dynavolt Intact GP (Kalex) 42m 17.186
15. Hafizh Syahrin Petronas Raceline Malaysia (Kalex) 42m 20.811