@TeamLHFTW: My money is on Hamilton.
@Renee: They are doing work ahead of the race to work out degradation, crucial in assessing strategy for Sunday.
Raikkonen slots in behind Alonso in P2, albeit five tenths down on his team-mate. He's done one lap less on the soft tyre though, so that time may come down.
Massa now goes first, two tenths faster than Bottas. The new benchmark a 1:38.214 but Hamilton on a flyer...
And Hamilton goes faster still, a full 1.1s clear of Massa. That's a huge advantage right there. Hamilton really on it today.
Remember, Rosberg yesterday said he had time in his pocket to get pole. He's going to need deep pockets at this rate.
@Renee: Not compulsory at all, but defeats the point of practice if teams don't practice with their tyres.
@Trirob: They have been restricted by the same rules in terms of their design and creation of the engine as everyone else, is what I meant. Honda has no advantage from entering when it is.
@MichaelBialocur: They did. I think the complexity of their car has come back to haunt them at times - but imagine if they didn't have any issues. No doubts at all they would have won every race this season without that and Rosberg's little incident in Belgium.
Rosberg's first lap is eight tenths off the pace of his team-mate.
Hulkenberg currently in seventh, an impressive standing for the German with Perez down in 12th.
@RahulAgarwal: I think McLaren. It's the only one which gives him a legitimate chance of a world championship, which has been his burning desire since his last one in 2006.
@Aditya: Ferrari would not have signed Vettel (presuming they have, of course) if Alonso hadn't opted out of or broken his deal.
Less than a minute left in this session.
@rocky: Hamilton has a contract with Mercedes until the end of 2015.
@rocky: Don't see why he would opt out of such a dominant car.
Rosberg doesn't improve on his own time with his last run as the clock expires. Ricciardo also gets onto the artificial grass on the approach to the final corner. He's still P6.
Hulkenberg and Sutil quite impressive in that session, both in the top ten, but as I always say, it's always risky reading too much into that.
There we have it - Hamilton makes it three in a row.
But can he do it again this afternoon? That's the key question.
Please be sure to come back again later today for coverage of qualifying. Thanks for joining me this morning.