Marc Marquez, undefeated in America since 2011, again looks the rider to beat after leading both MotoGP Friday practice sessions at the Circuit of the Americas.

The Repsol Honda star was 0.255s quicker than Jorge Lorenzo this morning, which he extended to 0.706s in the afternoon - despite sliding off at the final turn.

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The double world champion aside, lap times were close; One-second covering the next twelve riders, led by Ducati's Andrea Iannone. The Italian helped put last Sunday's disaster behind him by edging out Suzuki's Maverick Vinales and top satellite rider Scott Redding (Pramac Ducati).

Reigning champion Lorenzo and Yamaha team-mate Valentino Rossi were the final riders to lap within one-second of Marquez, Rossi left shaking his head after a mistake on his final lap robbed him of a higher position.

All riders were using a new soft Michelin rear, with a new medium due to arrive tomorrow morning - last minute changes being made in response to last weekend's troubles in Argentina.

An impressive seventh this afternoon was Avintia Ducati's Loris Baz, getting the better of factory stars Dani Pedrosa (Honda) and Andrea Dovizioso (Ducati) on a day when LCR Honda's Cal Crutchlow completed the top ten.

Further back, Eugene Laverty dropped to 16th after a fast fall from his Aspar Desmosedici, while Marc VDS rider Jack Miller was limping on his way to 20th after a big FP1 highside.

Riders will now wait to see if the new medium rear shakes up the order on Saturday.

FP2:
1. Marc Marquez
2. Andrea Iannone
3. Maverick Vi?ales
4. Scott Redding
5. Jorge Lorenzo
6. Valentino Rossi
7. Loris Baz
8. Dani Pedrosa
9. Andrea Dovizioso
10. Cal Crutchlow
11. Hector Barbera
12. Michele Pirro
13. Pol Espargaro
14. Aleix Espargaro
15. Yonny Hernandez
16. Eugene Laverty
17. Stefan Bradl
18. Alvaro Bautista
19. Bradley Smith
20. Jack Miller
21. Tito Rabat

MotoGP Update | Andrea Dovizioso drops a wheel over the kerb out of final turn #AmericasGP #MotoGP FP2 https://t.co/LkvfGEXEA4Posted by Peter McLaren on Friday, April 8, 2016