Maldonado has a little tweak on the approach to Turn 1 and decides to bin it through the escape road.
"Come on, there's no power!" Ericsson complains.
Very messy from Grosjean as he gets all out of shape on the approach to the Roggia, he has to run wide and take the escape road.
@mfbull: They actually don't have the exactly the same wing on this weekend.
Raikkonen, with a set of soft tyres on, goes into P2, 0.318s down on Rosberg's headline.
"The car is really pulling to the left when I hit the brakes," Button says, before we see him run across the Turn 1 escape road after being told to brake hard.
Replays show Vettel locking up and running across the Roggia's escape road.
Bottas moves into P1 on those soft tyres with a 1:25.366.
Rosberg climbs above Bottas on his latest medium tyre run, a 1:24.908.
Raikkonen moves to within three tenths of Rosberg and moves into P2.
Only two and a half minutes left in this session so expect the times to keep tumbling.
Vettel briefly moves into P1 but is displaced by Hamilton's 1:24.544.
Vettel only two tenths off the top of the timing screens currently though.
Maldonado moves into P6 in the Lotus. They could be in a good position for a strong result this afternoon.
"Who is talking on the radio all the time? The radio keeps opening all the time," complains Raikkonen.
Hulkenberg improves a bit on his time but can't improve on P12. Can't imagine that's his true pace given their speed yesterday. Hulkenberg didn't appear to have his DRS open down the main straight.
Rosberg improves on his own lap time but can't displace Vettel from P2.
@F1Addict: Ferrari has a junior driver called Raffaele Marciello who has won races in the series.
The chequered flag falls so drivers will complete their current lap.
Perez moves into P8 but also doesn't appear to have his DRS open. Hamilton goes purple through the middle sector but doesn't improve on his time.
Maldonado re-claims sixth position from Raikkonen.
So a mixed up top order but the wet track at the beginning will have had an impact on how things ended up. But Vettel and Ferrari will be buoyed by that position and the fact they are close to Mercedes on that soft compound tyre. Whether that remains the case in qualifying remains to be the case.
Further down, the McLarens are quite high up but we know the Red Bull drivers are focusing solely on race trim with those hefty engine penalties to come tomorrow.
The final gap between Hamilton and Vettel, for those of you asking, was 0.264s.
That's all we have time for in this session. Thanks as always for joining and please do be sure to come back in under two hours' time for the start of qualifying for the Italian Grand Prix.