Andrea Iannone upped his pace considerably to top the MotoGP warm-up session in Austin, depriving Marc Marquez of a clean sweep of placing first across the entire weekend.

Iannone's time was a full two tenths of a second faster than Marquez, with Valentino Rossi a further tenth slower in third place.

Suzuki's Maverick Vi?ales was a full half-second slower than that the first Yamaha man with Andrea Dovizioso (+0.862s) fifth and Aleix Espargaro (+1.086s) showing well in sixth.

Jorge Lorenzo crashed at speed toward the end of the session through the fast turn four. The Spaniard lost the front end of his Yamaha M1 at speed but was unharmed in the incident.

Cal Crutchlow) eighth, Bradley Smtih (ninth) and Yonny Hernandez (tenth) rounded out the top ten. Scott Redding's session was hampered by a machine issue, leaving the Englishman eleventh.

Warm-up:
1. Andrea Iannone
2. Marc Marquez
3. Valentino Rossi
4. Maverick Vi?ales
5. Andrea Dovizioso
6. Aleix Espargaro
7. Jorge Lorenzo
8. Cal Crutchlow
9. Bradley Smith
10. Yonny Hernandez
11. Scott Redding
12. Loris Baz
13. Dani Pedrosa
14. Stefan Bradl
15. Hector Barbera
16. Pol Espargaro
17. Michele Pirro
18. Alvaro Bautista
19. Eugene Laverty
20. Tito Rabat