Following Sunday's season-ending Valencia Grand Prix, a MotoGP test session began at the circuit on Tuesday.

A wet track prevented any action for the first two hours of testing, but conditions improved and Valentino Rossi was able to make his Ducati debut (on slick tyres) at 12:20 local time.

All others, except world champion Jorge Lorenzo and Ducati's Nicky Hayden, have now been on track.

That means 2007 world champion Casey Stoner has made his factory Honda debut, while rookies Cal Crutchlow and Karel Abraham have also been out.

These are the best lap times as of 2pm...

1. Dani Pedrosa ESP Repsol Honda Team 1m 33.722s
2. Ben Spies USA Yamaha Factory Racing 1m 33.863s
3. Marco Simoncelli ITA San Carlo Honda Gresini 1m 33.899s
4. Casey Stoner AUS HRC 1m 34.342s
5. Alvaro Bautista ESP Rizla Suzuki MotoGP 1m 34.441s
6. Andrea Dovizioso ITA Repsol Honda Team 1m 34.605s
7. Randy de Puniet FRA Pramac Racing 1m 34.871s
8. Colin Edwards USA Monster Yamaha Tech 3 1m 34.882s
9. Valentino Rossi ITA Ducati Marlboro Team 1m 35.134s
10. Hector Barbera ESP Paginas Amarillas Aspar 1m 35.217s
11. Hiroshi Aoyama JPN San Carlo Honda Gresini 1m 35.502s
12. Cal Crutchlow GBR Monster Yamaha Tech 3 1m 35.645s
13. Loris Capirossi ITA Pramac Racing 1m 36.578s
14. Toni Elias ESP LCR Honda MotoGP 1m 38.29s
15. Karel Abraham CZE Cardion AB Motoracing 1m 43.841s

2010 Valencia Grand Prix : Pole position: Casey Stoner AUS Ducati Marlboro 1m 31.799s Fastest race lap: Dani Pedrosa ESP Repsol Honda 1m 32.914s