Maverick Vinales gets the better of Marc Marquez during opening practice for the Austin MotoGP round.

Both riders set their best time while using the medium compound tyres front and rear.

Andrea Dovizioso was the first of three Ducatis in the top six, while rookie Johann Zarco continued to impress with fourth for Tech 3.

Vinales' team-mate Valentino Rossi once again made a slow start to the weekend, in eighth, while using the soft tyres.

Cal Crutchlow was the only faller...

1. Maverick Vi?ales ESP Movistar Yamaha MotoGP (YZR-M1) 2m 04.923s [Lap 10/17] 331km/h (Top Speed) 2. Marc Marquez ESP Repsol Honda Team (RC213V) 2m 05.500s +0.577s [15/19] 332km/h 3. Andrea Dovizioso ITA Ducati Team (Desmosedici GP17) 2m 05.604s +0.681s [13/15] 333km/h 4. Johann Zarco FRA Monster Yamaha Tech 3 (YZR-M1)* 2m 05.790s +0.867s [17/17] 331km/h 5. Alvaro Bautista ESP Aspar MotoGP Team (Desmosedici GP16) 2m 05.833s +0.910s [15/15] 337km/h 6. Jorge Lorenzo ESP Ducati Team (Desmosedici GP17) 2m 06.017s +1.094s [16/17] 336km/h 7. Dani Pedrosa ESP Repsol Honda Team (RC213V) 2m 06.109s +1.186s [5/16] 336km/h 8. Valentino Rossi ITA Movistar Yamaha MotoGP (YZR-M1) 2m 06.292s +1.369s [15/15] 331km/h 9. Aleix Espargaro ESP Factory Aprilia Gresini (RS-GP) 2m 06.411s +1.488s [14/14] 331km/h 10. Danilo Petrucci ITA Octo Pramac Racing (Desmosedici GP17) 2m 06.469s +1.546s [13/13] 332km/h 11. Cal Crutchlow GBR LCR Honda (RC213V) 2m 06.484s +1.561s [12/13] 331km/h 12. Jack Miller AUS Estrella Galicia 0,0 Marc VDS (RC213V) 2m 06.515s +1.592s [16/16] 330km/h 13. Scott Redding GBR Octo Pramac Racing (Desmosedici GP16) 2m 06.646s +1.723s [14/14] 333km/h 14. Jonas Folger GER Monster Yamaha Tech 3 (YZR-M1)* 2m 06.692s +1.769s [15/15] 330km/h 15. Hector Barbera ESP Reale Avintia Racing (Desmosedici GP16) 2m 06.786s +1.863s [9/15] 336km/h 16. Andrea Iannone ITA Team Suzuki Ecstar (GSX-RR) 2m 06.824s +1.901s [9/14] 326km/h 17. Tito Rabat ESP Estrella Galicia 0,0 Marc VDS (RC213V) 2m 06.894s +1.971s [13/17] 333km/h 18. Loris Baz FRA Reale Avintia Racing (Desmosedici GP15) 2m 07.127s +2.204s [12/17] 325km/h 19. Karel Abraham CZE Aspar MotoGP Team (Desmosedici GP15) 2m 07.300s +2.377s [15/15] 332km/h 20. Alex Rins ESP Team Suzuki Ecstar (GSX-RR)* 2m 08.006s +3.083s [10/16] 330km/h 21. Pol Espargaro ESP Red Bull KTM Factory Racing (RC16) 2m 08.128s +3.205s [6/15] 331km/h 22. Sam Lowes GBR Factory Aprilia Gresini (RS-GP)* 2m 08.292s +3.369s [13/16] 328km/h 23. Bradley Smith GBR Red Bull KTM Factory Racing (RC16) 2m 08.740s +3.817s [14/15] 326km/h

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

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Official Circuit of the Americas MotoGP records: Best lap: Marc Marquez SPA Honda 2m 2.135s (2015) Fastest race lap: Marc Marquez SPA Honda 2m 3.575s (2014)

By Peter McLaren

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I've never been to COTA but, it's gonna be hard to beat Barbers Motorcports Park, here in Alabama. Plus the "World's" largest motorcycle museum is at Barbers too.