Maverick Vinales overcomes a scare to lead opening practice session at the Termas de Rio Hondo in Argentina.

The Qatar winner held on to a violent shake from his M1, which set-off his air bag, while reigning champion Marc Marquez lost the front and fell during the middle stages.

Vinales went on to set his best laps with the medium rear while his closest rivals fitted a soft to push for a time attack in case of afternoon rain.

Following last year's tyre issues, all MotoGP riders must complete 5 timed laps on the hard rear in FP1-2. If not they'll receive 6 place grid penalty.

Alex Rins is competing despite a fracture to his right ankle in a motocross training accident last week...

1. Maverick Vi?ales ESP Movistar Yamaha MotoGP (YZR-M1) 1m 40.356s [Lap 17/19] 321km/h (Top Speed)2. Danilo Petrucci ITA Octo Pramac Racing (Desmosedici GP17) 1m 40.562s +0.206s [16/18] 320km/h 3. Johann Zarco FRA Monster Yamaha Tech 3 (YZR-M1)* 1m 40.574s +0.218s [20/20] 318km/h 4. Jonas Folger GER Monster Yamaha Tech 3 (YZR-M1)* 1m 40.660s +0.304s [19/20] 316km/h 5. Karel Abraham CZE Aspar MotoGP Team (Desmosedici GP15) 1m 40.678s +0.322s [18/18] 320km/h 6. Andrea Iannone ITA Team Suzuki Ecstar (GSX-RR) 1m 40.701s +0.345s [17/18] 317km/h 7. Andrea Dovizioso ITA Ducati Team (Desmosedici GP17) 1m 40.716s +0.360s [15/16] 323km/h 8. Hector Barbera ESP Reale Avintia Racing (Desmosedici GP16) 1m 40.853s +0.497s [18/19] 324km/h 9. Jack Miller AUS Estrella Galicia 0,0 Marc VDS (RC213V) 1m 40.867s +0.511s [16/20] 318km/h 10. Alvaro Bautista ESP Aspar MotoGP Team (Desmosedici GP16) 1m 40.936s +0.580s [17/17] 325km/h 11. Marc Marquez ESP Repsol Honda Team (RC213V) 1m 40.958s +0.602s [11/18] 317km/h 12. Aleix Espargaro ESP Factory Aprilia Gresini (RS-GP) 1m 40.982s +0.626s [16/17] 317km/h 13. Scott Redding GBR Octo Pramac Racing (Desmosedici GP16) 1m 41.062s +0.706s [17/18] 320km/h 14. Cal Crutchlow GBR LCR Honda (RC213V) 1m 41.073s +0.717s [16/17] 317km/h 15. Jorge Lorenzo ESP Ducati Team (Desmosedici GP17) 1m 41.128s +0.772s [16/19] 325km/h 16. Valentino Rossi ITA Movistar Yamaha MotoGP (YZR-M1) 1m 41.311s +0.955s [16/19] 318km/h 17. Alex Rins ESP Team Suzuki Ecstar (GSX-RR)* 1m 41.694s +1.338s [17/19] 318km/h 18. Tito Rabat ESP Estrella Galicia 0,0 Marc VDS (RC213V) 1m 41.703s +1.347s [17/18] 317km/h 19. Dani Pedrosa ESP Repsol Honda Team (RC213V) 1m 41.781s +1.425s [10/17] 316km/h 20. Pol Espargaro ESP Red Bull KTM Factory Racing (RC16) 1m 41.829s +1.473s [16/16] 315km/h 21. Loris Baz FRA Reale Avintia Racing (Desmosedici GP15) 1m 41.867s +1.511s [14/16] 313km/h 22. Bradley Smith GBR Red Bull KTM Factory Racing (RC16) 1m 42.224s +1.868s [18/19] 313km/h 23. Sam Lowes GBR Factory Aprilia Gresini (RS-GP)* 1m 42.237s +1.881s [16/17] 315km/h

Blue Name = Rides for Factory Team . Red Name = Rides for Satellite Team.

* Rookie

CLICK HERE for pictures from the event

Official Termas de Rio Hondo MotoGP records: Best lap: Marc Marquez SPA Honda 1m 37.683s (2014)Fastest race lap:Valentino Rossi ITA Yamaha 1m 39.019s (2015)