Jorge Lorenzo got Yamaha's Italian Grand Prix weekend off to a strong start with a commanding performance in the opening MotoGP practice session at Mugello.
The current points leader led the majority of the morning, eventually reaching a time of 1m48.131s with his final lap.
Lorenzo's closest challenger ultimately proved to be Casey Stoner. The Honda rider had a quiet start, spending much of the session near the foot of the top 10, before steadily improving his pace to end up half a second down on the Yamaha.
Sachsenring winner Dani Pedrosa lost second to team-mate Stoner late on, but remained third.
Ducati's home grand prix weekend started relatively well, with Nicky Hayden fourth and Valentino Rossi sixth.
The pair were split by Tech 3 Yamaha pair Cal Crutchlow and Andrea Dovizioso, as Crutchlow made it into the top five despite stopping on track with a mechanical problem on his main bike.
Lorenzo's team-mate Ben Spies had a minor fall when he ran wide through the gravel. There was a similar incident for Gresini Honda rider Alvaro Bautista, who tried his utmost to keep his bike running through the San Donato gravel before ultimately having to tip it onto its side.
That left Bautista at the back of the prototype pack - which is only 11 bikes this weekend with the injured Karel Abraham's Cardion Ducati absent.
Aspar's Randy de Puniet and Aleix Espargaro led the CRT field.
Pos Rider Team/Bike Time Gap 1. Jorge Lorenzo Yamaha 1m48.131s 2. Casey Stoner Honda 1m48.649s + 0.518s 3. Dani Pedrosa Honda 1m48.877s + 0.746s 4. Nicky Hayden Ducati 1m48.981s + 0.850s 5. Cal Crutchlow Tech 3 Yamaha 1m49.023s + 0.892s 6. Andrea Dovizioso Tech 3 Yamaha 1m49.038s + 0.907s 7. Valentino Rossi Ducati 1m49.074s + 0.943s 8. Hector Barbera Pramac Ducati 1m49.166s + 1.035s 9. Ben Spies Yamaha 1m49.398s + 1.267s 10. Stefan Bradl LCR Honda 1m49.438s + 1.307s 11. Alvaro Bautista Gresini Honda 1m49.688s + 1.557s 12. Randy De Puniet Aspar Aprilia 1m50.949s + 2.818s 13. Aleix Espargaro Aspar Aprilia 1m51.101s + 2.970s 14. Mattia Pasini Speed Master Aprila 1m51.253s + 3.122s 15. Michele Pirro Gresini FTR-Honda 1m51.835s + 3.704s 16. Yonny Hernandez Avintia BQR-Kawasaki 1m51.973s + 3.842s 17. Colin Edwards Forward Suter-BMW 1m52.154s + 4.023s 18. Danilo Petrucci Ioda-Aprilia 1m52.952s + 4.821s 19. James Ellison Paul Bird Aprilia 1m53.390s + 5.259s 20. Ivan Silva Avintia Inmotec-Kawasaki 1m53.931s + 5.800s