Reigning Moto2 champion Johann Zarco got his title defence back on track in Argentina with a controlled win ahead of Sam Lowes and Jonas Folger.
The race began in slightly damp conditions following earlier rain, albeit with everyone starting on slick tyres, and it was Folger who grabbed the lead from Zarco and poleman Lowes at the start.
Lowes moved ahead of Zarco on the second lap, before taking the lead on the following tour as Folger ran out wide - Franco Morbidelli also joining the leading pack as the quartet pulled away from the rest.
Another error by Folger on lap 8 allowed Zarco and Morbidelli through into second and third, but it was only Zarco who was able to put leader Lowes under serious pressure.
The decisive move of the race came on lap 13 as Zarco moved to the front for the first time, although with four laps to go Lowes ran very wide to slip behind Morbidelli, barely keeping third from Folger.
However, Lowes soon re-passed Morbidelli, who then squandered a chance of a third-place finish on the penultimate lap as he fell at low speed at Turn 1, clinging to his Kalex machine as it went down and proving unable to restart it.
It completed a miserable race for the Marc VDS team, as Alex Marquez had crashed out early on.
That left Zarco to cruise home with a 1.3 second advantage over Lowes, with Folger completing the podium a further 1.4s back.
Alex Rins was the fastest man in the closing stages, but having started back in 11th, the Pons rider ran out of time to catch the leading trio, and was forced to be content with fourth place.
Dominique Aegerter narrowly held off Hafizh Syahrin in a spirited battle for fifth place, with Qatar winner Thomas Luthi a subdued seventh ahead of Axel Pons, Takaaki Nakagami and Mattia Pasini.
Xavier Simeon was the top non-Kalex rider in 12th aboard the best of the Speed Up machines, one place ahead of Lorenzo Baldassarri - who scored three points two weeks on from dislocating both shoulders in Qatar.
|1||Johann Zarco||Ajo Motorsport||Kalex||40:57.806|
|2||Sam Lowes||Gresini Racing||Kalex||+1.347|
|3||Jonas Folger||Dynavolt Intact GP||Kalex||+2.754|
|4||Alex Rins||Paginas Amarillas HP 40||Kalex||+6.101|
|5||Dominique Aegerter||Technomag Racing Interwetten||Kalex||+17.384|
|6||Hafizh Syahrin||Petronas Raceline Malaysia Team Honda||Kalex||+17.484|
|7||Thomas Luthi||Garage Plus Interwetten||Kalex||+26.411|
|8||Axel Pons||AGR Team||Kalex||+31.016|
|9||Takaaki Nakagami||Idemitsu Honda Team Asia||Kalex||+31.403|
|10||Mattia Pasini||Italtrans Racing Team||Kalex||+31.816|
|11||Marcel Schrötter||AGR Team||Kalex||+32.329|
|12||Xavier Simeon||QMMF Racing Team||Speed Up||+40.968|
|13||Lorenzo Baldassarri||Forward Racing||Kalex||+47.883|
|14||Xavi Vierge||Tech 3 Racing||Tech 3||+56.027|
|15||Luis Salom||SAG Team||Kalex||+58.278|
|16||Danny Kent||Leopard Racing||Kalex||+58.437|
|17||Ratthapark Wilairot||Idemitsu Honda Team Asia||Kalex||+58.615|
|18||Luca Marini||Forward Racing||Kalex||+59.245|
|19||Julian Simon||QMMF Racing Team||Speed Up||+59.535|
|20||Simone Corsi||Speed Up Racing||Speed Up||+59.878|
|21||Miguel Oliveira||Leopard Racing||Kalex||+1:00.406|
|22||Robin Mulhauser||Technomag Racing Interwetten||Kalex||+1:09.254|
|24||Isaac Viñales||Tech 3 Racing||Tech 3||+1:16.792|
|25||Franco Morbidelli||Estrella Galicia 0,0 Marc VDS||Kalex||+1:41.530|
|26||Efren Vazquez||JPMoto Malaysia||Suter||+1 lap|
|27||Alessandro Tonucci||Tasca Racing Scuderia Moto2||Kalex||+1 lap|
|R||Sandro Cortese||Dynavolt Intact GP||Kalex|
|R||Alex Marquez||Estrella Galicia 0,0 Marc VDS||Kalex|
|NS||Edgar Pons||Paginas Amarillas HP 40||Kalex|