Casey Stoner retained his position at the top of the British MotoGP timesheets during a cold, damp and windy final practice session at Silverstone on Saturday morning.

The session also saw a revival in form for Yamaha's title leader Jorge Lorenzo, who led much of the session on his way to second place after a relatively poor Friday performance.

But the big news for the British fans was a nasty fall for home hero Cal Crutchlow early in the 45-minute session.

Crutchlow - who broke his collarbone on the Saturday of the 2011 event - was sent bouncing across the asphalt by a lowside through the fast left-hander on to the Hangar Straight.

The Yamaha Tech 3 rider underwent x-rays for a possible ankle fracture but a later update suggested that it is only a sprain. Rookie Stefan Bradl also failed to post a lap time after suffering a finger injury in an unseen high side.

Spots of rain at the start of the session kept most riders in the pits, with the notable exception of Valentino Rossi, fastest in Friday's wet morning session but left eleventh and last of the manufacturer riders in the dry afternoon session.

The Italian superstar missed the inaugural 2010 Silverstone round due to injury and struggled to learn the long and wide airfield layout last season.

Despite the conditions, Rossi beat his best Friday time after ten minutes, prompting others to take to the track - although Rossi then had a big moment, almost losing the front under braking and running through the gravel at the final turn.

Shortly after, with around 30-minutes of the session remaining, Crutchlow and Bradl suffered their accidents.

By that stage world championship leader Jorge Lorenzo had taken over at the top from Rossi, where the Spaniard remained until title rival and Friday pace setter Stoner took over with eleven minutes remaining.

Stoner kept his Repsol Honda in P1 for the rest of the session, setting his best lap time of 2m 3.941s on his final circulation. That was almost one-second under his Friday time and within a few tenths of the official race lap record, from 2010.

Lorenzo, who holds 20-point advantage, finished a sizeable 0.416s behind, but second place marked a clear improvement over his disappointing seventh on Friday. Factory Yamaha team-mate Ben Spies sealed third (+0.486s) on his final lap.

The Texan's rise came at the expense of Tech 3's Andrea Dovizioso, who was pushed to fourth, with Gresini Honda's Alvaro Bautista continuing his strong weekend with fifth place and the final rider within one-second Stoner.

Sixth went to Stoner's Repsol Honda team-mate Dani Pedrosa, with Nicky Hayden the top Ducati in seventh (+1.173s). Rossi dropped all the way back to ninth, 2.6s from Stoner and slowest of the manufacturer bikes to complete a lap, by the conclusion of the session.

0.6s behind Rossi was the top CRT machine of Aspar's Randy de Puniet, who narrowly outpaced team-mate Aleix Espargaro.

Cardion AB Ducati's Karel Abraham is unfit to ride this weekend due to finger fractures in his left hand sustained in testing at Aragon.

Silverstone is the first event where the new specification Bridgestone slick front tyre becomes the only construction available.

Lorenzo (3) and Stoner (2) are the only riders to win races so far this year and also the only riders to win at Silverstone since the circuit rejoined the MotoGP calendar in 2010.

Qualifying takes place this afternoon.

Saturday practice:

1. Casey Stoner
2. Jorge Lorenzo
3. Ben Spies
4. Andrea Dovizioso
5. Alvaro Bautista
6. Dani Pedrosa
7. Nicky Hayden
8. Hector Barbera
9. Valentino Rossi
10. Randy De Puniet
11. Aleix Espargaro
12. Michele Pirro
13. James Ellison
14. Mattia Pasini
15. Yonny Hernandez
16. Danilo Petrucci
17. Ivan Silva
18. Colin Edwards


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