Alonso still out on the medium tyres, he's accumulated 16 laps on these tyres and still chipping away at those times - so he'll be getting some good data from that run.
Raikkonen also slipping and sliding around this circuit, he's still down in P8.
Button leaps back to P1, another superb lap from the 2009 world champion, but then Rosberg lowers that by a tenth to reclaim the position. His new benchmark a 1:40.596.
Magnussen is absolutely flying in the middle sector, and Magnussen now goes into P1 with a 1:494. McLaren looking really fiesty this weekend - but then remember, we don't know relative fuel loads or engine settings in this session.
Wow. Hamilton drops below the 1:40 mark and knocks six tenths off Magnussen - he leaps clear of everyone with a 1:39.817. His last sector time was half a second quicker than we've seen so far.
That was a bit like the end of a Q3 session, there. Lots of chopping and changing at the top of the timing screens.
Rosberg now goes quicker in the middle sector...
But he runs wide at the penultimate corner and backs off. Looked like he would have been close to Hamilton's benchmark there.
Alonso still in the pits. Only he and Vettel yet to set a time on the soft tyre.
Hamilton absolutely flying out there as the track starts to rubber in. He's gone quickest through the first two sectors...
And he improves his lap time to a 1:39.630.
Ricciardo the latest driver to be caught out by that penultimate corner. There being a good example of the pitfalls of a run off area, as any mistake there goes completely unpenalised.
Red Bull still not showing any huge signs of improvement but, once again, Ricciardo significantly up on Vettel. There's nearly a second between them at the moment.
Ah, apologies - Vettel is yet to use the soft tyre
So don't read into that gap just yet.
Let's just hope this is not a false dawn for McLaren because it would be great to see them back at the front of the pack. And probably food for thought for someone like Alonso....
@RajeshMudhiraj: No word from Force India yet.
Kvyat really pushing that Toro Rosso, which he complained earlier was lacking grip. He's had a few little wobbles on his last lap.
Vettel and Alonso are both out on the soft tyre.
Hulkenberg heads out but still no sign of Perez...
Vettel does not appear to be pushing on his first lap, probably to warm those tyres up. He had a bit of a wobble on the exit of the final corner, so would have started his lap a bit slower than he wanted.
Alonso slots into P8 with his first lap, 1.774s off Hamilton's benchmark.
@DonovanKimiFan: On today's pace, yes. But remember, lots we don't know about what they are and aren't running. Vettel's currently on a flying lap, so let's see where that puts him.
Hulkenberg has had an off-track moment at Turn 13.
Vettel the latest driver to run wide at the penultimate corner, so still no clean qualifying simulation lap from the world champion.