1 Verstappen 2 Ricciardo 3 Vettel 4 Hamilton 5 Perez 6 Hulkenberg 7 Bottas 8 Kvyat 9 Ocon 10 Raikkonen

Romain Grosjean has also had a spin at Turn 16, while we're just seeing a replay of a very wild sideways moment for Max Verstappen at Turn Two. The Dutchman was sawing away at the wheel there to keep the Red Bull in more or less a straight line.

Big moment for him.

The Sauber of Marcus Ericsson missed his braking at Turn 18 and needed to back up to take the corner.

No major drama and on he goes.

Red Bull also fancy their chances this weekend and they have now gone first and second on the ultra soft tyre, Ricciardo's 1:43.664 putting him 0.3s up on team-mate Verstappen.

And no sooner have I said that....

Verstappen goes fastest again, raising the bar another three tenths.

The Mercedes cars have not gone out on the quicker ultra-soft yet.

Image source, Getty Images

Daniel Ricciardo's Red Bull goes second, 0.3s off Hamilton.

The Ferraris, who we expect to have the edge on Mercedes this weekend, are taking it pretty easy.

Sebastian Vettel has their best time so far, his 1:449 putting him fourth at present, eight tenths off Hamilton.

Andrew Benson
BBC Sport’s chief F1 writer in Singaore

If the competition has been cut-throat off in recent weeks, it could be just as intense on it here at Marina Bay this weekend.

The battle between Lewis Hamilton and Sebastian Vettel for the championship has been see-sawing backwards and forwards all season, and it is likely to swing the Ferrari driver’s way again this weekend.

But the likelihood is that Red Bull will join their battle for victory. “I have confidence in myself and in the team,” said Daniel Ricciardo, who has proven to be something of a Singapore specialist in the last few years. “I think we come here with a good chance. Third, second, second, both seconds were close to wins, hopefully this is the one.”

Image source, Getty Images

A 1:44.236 puts Lewis Hamilton into the lead of this session, over a second clear of Bottas.

The track is largely dry after the rain earlier today but there are patches out there, particularly on the kerbs.

Nico Hulkenberg gives a demonstration of the kerbs' slipperiness as he slides off one and perilously close to the wall.

He survives and duly plonks the Renault into the top three.

Bottas remains at the head of the pack and he has now improved the benchmark to a 1:45.30. That's 1.2s up on team-mate Lewis Hamilton, then it's Sergio Perez in the Force India another second back.

A wee reminder that the esteemed Jack Nicholls, Tom Clarkson and Jennie Gow are on air right now to talk you through events both on and off the track out in Singapore.

Listen in via the audio tab at the top of this page.

We have a time on the board and it's a 1:48.770 for the Mercedes of Valtteri Bottas, who of course is celebrating earning a one-year contract extension with Mercedes after his sterling work so far this season.

Looks thrilled.

We'll have more on this from Andrew Benson shortly, but in a nutshell the news is that 2016 world champion Nico Rosberg is to play a role in Robert Kubica's attempt to return to F1 six years after he suffered serious injuries in a rally crash.

Both Mercedes cars are now out so all the drivers have had a sighter. No times set yet.

Andrew Benson
BBC Sport’s chief F1 writer in Singaore

What to expect of Mercedes this weekend? Well, the silver cars have not been at their most competitive on low-grip, slow-speed tracks this season, and on top of that Singapore has proved something of a bete noir in recent years - notwithstanding the fact that they have won two of the last three races here. The fact is that Mercedes do not have a high-downforce package that has as much downforce as those of Ferrari and Red Bull, and the team have been expecting a tough time in Singapore for some time. Lewis Hamilton said: “We all know this weekend is going to be a lot harder for us as the other two teams have, like, another wing step to us. They have more downforce. So it is going to be a difficult weekend but I still come here with the mentality and drive of trying to do the unexpected.”

Image source, Getty Images

All the drivers have now done an installation lap bar those chilled out Mercedes brothers.

Kimi Raikkonen and Daniel Ricciardo also have halos on the Red Bull and Ferrari.

FP1 gets under way.

Antonio Giovinazzi, he formerly of the Sauber parish, is again in the Haas, replacing Kevin Magnussen.

Down at Toro Rosso, the soon-to-depart Carlos Sainz is replaced by Indonesian driver Sean Gelael, who is currently racing with limited success in Formula 2.