That result breathes new life in the title race, as Lorenzo claws back nine points on Stoner. We're back in two weeks as MotoGP goes to Aragon!
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Brilliant win for Jorge Lorenzo!! Pedrosa second, Stoner third, and Simoncelli takes fourth by fractions from Dovizioso - four hundredths the gap! Great battle!
Last lap, and it's an amazing battle between Simoncelli, Dovizioso and Spies! They are virtually going through corners three abreast. Woderful racing.
Colin Edwards has dropped back to 13th....
Three laps to go, and Jorge Lorenzo is within touching distance of a superb triumph.
Side by side!! Dovi dives down the inside of Simoncelli, but the Gresini Honda man responds with an uncompromising move!
We're going to have a great battle for fourth in the closing laps - Simoncelli, Dovizioso and Spies dicing for all they are worth...
And there's the move! Not much resistance from Stoner, who slips back to third, and that will cost him four championship points.
Pedrosa is all over Stoner now - surely just a matter of time until the Honda man goes second.
Rossi has fallen off the battle for fourth and will have to make do with seventh. He's comfortable in that position with a large gap back to Alvaro Bautista.
Stoner clocks a 1:35.2, which is pretty slow really. Pedrosa is homing. Lorenzo is now almost five seconds clear. This race is his.
Cal Crutchlow remains 10th, but he is right on the back wheel of Colin Edwards.
Pedrosa is now within a second of Stoner in second. The championship leader is short of pace and struggling..
The four-way battle for fourth is as follows: 4-Simoncelli, 5-Dovizioso, 6-Spies, 7-Rossi.
Spies gets the better of Valentino Rossi to go sixth. The Ducati's lack of pace is starting to tell...
And again - this looks like a decisive move from Jorge Lorenzo, who stretches his margin to 1.9 seconds. Pedrosa is running a lonely third and there is a four-way battle for fourth behind him.
Lorenzo takes another three tenths out of Stoner, and the lead is now a whopping 1.4 seconds! Tremendous charge from the Yamaha man.
Fastest lap of the race from Lorenzo! He nails a 1:33.9 and suddenly he leads Stoner by a second!
A mechanical problem has put paid to Loris Capirossi's chances. He says he does not know precisely the problem, but there was an issue with the chain.
Stoner remains right on Lorenzo's back wheel. He doesn't seem to be making all that much effort to pass him. Is he happy to bide his time and strike later in the race?
How they stand: 1-Lorenzo, 2-Stoner, 3-Pedrosa, 4-Simoncelli, 5-Dovizioso, 6-Rossi, 7-Spies, 8-Edwards, 9-Bautista, 10-Crutchlow, 11-Aoyama, 12-Barbera, 13-Abraham, 14-De Puniet, 15-Elias, 16-Capirossi.
Simoncelli is into fourth! He clocks his best lap of the race, a 1:35.123. It is now fairly dry...
Lorenzo manages to slide both the front and rear tyres through a fats right-hander. He is right on the limit but Stoner remains within a tenth of a second.
Now Simoncelli is all over the back of Dovizioso in fourth - he will surely be through before long.
Nicky Hayden is out of the race - no way he could get going again after that fall. He is back in the pits.
Simoncelli dives down the inside of Rossi - it's a hard move and they nearly touch!
The top three - Lorenzo, Stoner, Pedrosa - are just starting to escape. There's a margin of about a second and a half from third to fourth.
Lorenzo's lead is just six hundredths from Stoner, with Pedrosa, Dovizioso, Rossi, Simoncelli and Spies in close attendance.
Hayden down! He is in the gravel - the American qualified 15th and that tops off an awful weekend for him.
Fastest lap for Rossi, who clocks a 1:35.589 and is into fifth.
Valentino Rossi is up to sixth, and the slippery conditions will suit his lack of power on the Ducati...
GOOOOO!!! It's a tentative first lap with flags being waved to warn of water on the track - the teams are getting their wet bikes ready. Down on the track, Jorge Lorenzo has taken the lead from Stoner, followed by Hondas Pedrosa and Dovizioso.
They're off on the warm-up lap and there are drops of water on the aerial camera.
The grid: 1-Casey Stoner, 2-Jorge Lorenzo, 3-Dani Pedrosa, 4-Ben Spies, 5-Marco Simoncelli, 6-Andrea Dovizioso, 7-Colin Edwards, 8-Alvaro Bautista, 9-Hector Barbera, 10-Hiroshi Aoyama, 11-Valentino Rossi, 12-Karel Abraham, 13-Cal Cructhlow, 14-Randy De Puniet, 15-Nicky Hayden, 16-Loris Capirossi, 17-Toni Elias.
The weather could be a big factor today - there are drops of rain in the air here, and that could cause havoc.
Welcome to LIVE coverage of the San Marino MotoGP from Misano!