Some excellent punditry from Damon Hill there.
@f1MP-30: No news from McLaren yet, but a worrying start to the day for him.
Rosberg is the first to bolt on a set of super-soft tyres. Alonso follows suit. Get ready for those times to start tumbling again.
So Rosberg's initial benchmark was a 1:48.575, his first time on the super-soft is 1:47.488, only improving by a second. It does look like he lost something in sector one, however.
Hulkenberg is also out on a set of super-softs. He's another driver really throwing his car around.
Hulkenberg goes goes second, with a massive 2.7s improvement on his first time. That would suggest Rosberg could have gone much, much quicker with his run.
Alonso is on an absolute flier, too.
Alonso goes purple in the first two sectors and jumps to the top of the timing screens, nearly two tenths quicker than Rosberg.
Ricciardo appears to have hit a bit of traffic on his flying lap, as he slots into P2, 0.051s off Alonso. Bottas the man in front of him, gearing up for his own flying lap.
Hulkenberg's was a 1:47.450. That's currently 1.1s off Alonso's.
Massa's latest puts him fourth - much, much better from yesterday for Williams then.
Bottas slots in three tenths behind his Massa, putting him fifth.
Raikkonen settles in behind Bottas in sixth. Nine tenths separating the Ferrari drivers then.
Perez goes ninth fastest, six tenths off Hulkenberg.
Hamilton's first super-soft tyre only puts him fourth, 0.439s down on Alonso and three tenths off his team-mate. Possible Hamilton hit some traffic, but potentially Mercedes not as quick as they were yesterday on super-soft. Watch this space.
The replays suggest it was quite a scruffy lap for Hamilton.
Only Alonso and Hulkenberg in the pits as we enter the final five minutes.
Yep. I wouldn't read too much into these times - free practice is always one where you need to take times with a pinch of salt.
@WL: In this session, yes, on the super-soft. But then fuel loads are unknown. Mercedes looked mighty quick yesterday. Maybe Red Bull has closed the gap, maybe Mercedes is holding something back or doing something which masks their true pace, like running with more fuel.
@AnderKaver: I think Perez will actually beat Hulkenberg a few more times this season, he's looked really good in the last few races. Hulkenberg has been great this year but he needs a big result.
Magnussen should beat Button, too. The Dane looks really impressive.
@Kristiyan: Looking at it, Hamilton really doesn't look comfortable with his car. I still think it will be a Mercedes battle in this one, though.
Vergne has a monumental lap and goes three tenths off Alonso's time with the super-soft tyre.
Alonso looks like he will top another session, and he's in the garage clambering out of his car.
Bottas and Raikkonen go down the pit lane with just 40 seconds later, probably to do a practice start at the end of the lane.
Ericsson a mighty 4.2s off the pace, and six tenths off Kobayashi. If you follow my commentary usually you will know my opinion on him... and well.
The clock expires, and Alonso is top again. Ricciardo second from Rosberg, with JEV a surprise entry into the top four. Vettel managed to jump ahead of Hamilton, who really appears to be struggling with the feel of his car.
Qualifying should be utterly fascinating, especially if Ferrari and Red Bull are in the mix for the front two rows.
Righto, there we have it. The cars return to the garages and we now wait for qualifying - just under two hours away.
Please be sure to join us again for qualifying - it proves to be another session not to be missed!