The results are on the left. Thank you for joining me for this race - not the best in the end, but plenty of drama at the start...
Follow the Grand Prix San Marino live with Eurosport. This MotoGP race starts at 13:00 on 16 September 2012. Find race results, calendar, standings, scores and all of this season’s MotoGP fixtures.
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Rea, a star in World Superbikes, took an impressive eighth spot.
That is confirmed by race direction. The riders' standings should update shortly.
And Dovi pulls alongside Bautista on the straight... Bautista takes the final podium spot by just 3/1000ths of a second!
The crowd go wild as Vale Rossi finishes second...
JORGE LORENZO WINS THE SAN MARINO GRAND PRIX!
Lorenzo five seconds ahead of Rossi, who is just under two seconds clear of Bautista in third. However Dovi is right behind him!
Lorenzo and Rossi all alone while there is still a battle on for third...
Espargaro out from 10th.
Dovizioso on Bradl's rear wheel... and he is past for fourth. Spies now battling him for fifth - and takes it! Bradl is making his 100th GP start but has not had the best couple of corners there.
Spies, who will ride for Pramac Ducati next year, sixth on the factory Yamaha. He has failed to finish at the last three races.
There has been little movement in the field this afternoon. San Carlo Gresini Honda rider Bautista is the man of the race so far - he stands two seconds behind Rossi.
And he comes through to take the podium spot! Can he now chase down the Ducati and upset the Rossi-loving hordes at what is effectively his home race?
Bautista now in a fight for third.
Lorenzo now 5.5s clear while Rossi is a second ahead of Bradl in third.
Bautista fourth after overtaking Dovi.
Should things stay like this, Lorenzo will have 270 points with Pedrosa definitely stuck on 232. The injured Casey Stoner will remain third on 186 and Dovi will move on to 163.
Rossi pulling clear a little in second again while Bautista is now 0.2s behind Dovizioso.
De Puniet is past Espargaro for ninth.
Lorenzo now more than four seconds clear.
Rea still eighth while the other Briton Ellison stands 14th.
The gap is now 3.4 seconds from Lorenzo to Rossi. Bautista lapping very quickly and just over a second behind Dovi now.
LCR Honda rider Bradl right up on Rossi, who will rejoin Lorenzo at the Yamaha factory outfit next year of course.
Dovi falling further behind the podium places in terms of time - still fourth though.
Yamaha star Lorenzo has eked out a two-second gap to Rossi on the Ducati.
With 20 laps remaining, the order is: Lorenzo, Rossi, Bradl, Dovizioso, Bautista, Spies, Hayden, Rea, Pol Epargaro, Randy de Puniet, Yonny Hernandez, Michele Pirro, James Ellison, Colin Edwards, Danilo Petrucci, David Salom.
Bautista, who won the 250cc GP at Misano in 2008 - and had his best grid placing since he was on pole at Silverstone with fifth here - gets past Spies for fifth spot.
Mattia Pasini is also out of the race after a crash. Briton Rea started from ninth on his grand prix debut and is up one place to eighth.
After his third place finish at Brno, Cal was aiming to become the first British rider since Ron Haslam in 1987 to score back-to-back podium finishes in the top class. Oh well.
CRUTCHLOW NOW OUT! He was looking to get past Dovizioso and highsided the Tech 3 Yamaha.
Lorenzo's lead stands at half a second from Rossi.
In fact it was Abraham who crashed not Barbera - what a shocker he has had after that start from the pitlane. It was a spectacular one, too.
Behind Lorenzo Valentino Rossi is up to second from his starting position of sixth. Stefan Bradl up one place in third, Andrea Dovizioso up three in fourth, Briton Cal Crutchlow down two in fifth then Ben Spies, Alvaro Bautista, Nicky Hayden and Jonathan Rea.
PEDROSA IS OUT! He collided with Hector Barbera, who is also out.
Lorenzo already has a big lead!
OFF WE GO!
They are off on a warm-up lap again... Pedrosa to start from the back. Disaster for him.
What caused the issue was, in fact, a problem with the starting lights. Strange start to this afternoon's premier class race.
This circuit is 4.2km miles in length and 14m wide. There are six left turns and 10 right turns. It returned to the calendar in 2007.
Karel Abraham it was who jumped.
We will have to redo the whole pre-race - sighting lap and everything - and we lose one lap from it. That makes it 27 laps long.
We have a jump-start!
The warm-up lap begins - and Pedrosa has problems getting away and needs a push start!
Lorenzo will be looking to extend his winning streak in Italy, having won at Mugello earlier this year and at both Mugello and Misano last year.
Pedrosa starts from pole for the fourth time this year. Following wins at Indianapolis and Brno, Pedrosa will be aiming to take three successive wins for the first time in the MotoGP class.
And in Moto2, Marc Marquez claimed his seventh victory of the season after a fantastic last-lap battle with Pol Espargaro in an interrupted race.
In Moto3 this morning, Sandro Cortese thwarted a brave Maverick Vinales fight back to extend his championship lead with a masterful ride.
Pedrosa edged out Lorenzo in a session that came alive in the final 10 minutes.
Dani Pedrosa starts on pole for the San Marino GP as he seeks to close the gap to MotoGP standings leader Jorge Lorenzo.