We'll be back with coverage of final practice from 12.00pm UK time on Saturday ahead of qualifying at 3.00pm.
Free Practice 2
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So with no further improvements, Vettel does indeed blow away his rivals. Webber is second from Button, who is over a second off the pace. Alonso is fourth from Hamilton.
Hamilton completes his work with a 1:54, likewise Button with a 1:53.
Vettel is running on track but with heavy fuel - five seconds off his best.
Hamilton has had a nosecone change. Renault's Kubica will attack late on on fresh tyres after a hydraulics problem was rectified.
Massa comes out for one last run.
Alonso back in the pits.
The circuit busy as the teams check over the super-soft tyres for wear.
Germany's Nick Heidfeld is still facing an uncertain future despite agreeing a five-race comeback deal with Sauber.
We're in the heavy fuel period of the weekend now, with little improvement throughout the field.
Downtown Singapore looks majestic in the darkness as the yellow flags are no more. /// Jenson-save-fuel Save-fuel: "The counterclockwise circuit favors drivers like Massa. If it rains during the qualifiers and the race, Schumacher might be on the podium on Sunday."
Malaysian motor sport boss Tony Fernandes will breathe new life into one of motor racing's most emotive marques by renaming his Formula One team as Team Lotus for 2011.
He tries to roll it off track himself - but eventually the stewards leap into action to wheel it away from the passing cars.
Alonso reverses the Ferrari back on to the track - and stalls it!
Alonso fastest through the first sector but is 0.1s down at the end of the second one... and at turn 17 clips a kerb which means he has to go straight on.
Webber six-tenths off Vettel's pace now while Kobayashi runs wide but safely guides the car back to the track. Kovalainen goes straight on at the final corner and brings the car back safely.
Hamilton fifth behind Alonso while Schumacher is ninth ahead of Massa.
Kovalainen with a wobble off track, which at a tight circuit like this is a serious matter - somehow he keeps it on a straight line and misses the looming barriers.
Glock has a problem and will bring the Virgin back to the pits... Webber goes second with 1:47.667, over a second behind Vettel. Two Red Bulls leading the way now.
There's no stopping him - 1:46.660 the latest as the German goes on the charge. Button in second over a second slower than him.
Hamilton fourth with 1:47.988.
Another very quick time to compare favourably with the pole one from last year - 1:46.974 from that man Vettel.
Vettel blows everyone away with 1:47.168!!!!!!!!!
Alonso crosses the line soon afterwards for P2, two-tenths off the benchmark.
With Webber waiting for the chance to go back out, Button takes over at the top with 1:47.690.
Top 10 at the halfway point: 1.Vettel 2.Alonso 3.Hamilton 4.Webber 5.Barrichello 6.Button 7.Kubica 8.Massa 9.Hulkenberg 10.Schumacher
Alonso gunning for Vettel, his 1:47.977 just 0.153 off the pace.
The yellow flags are out as the German continues to tootle around the circuit. He eventually pulls off at turn 18.
Sutil misses the first apex of the turn 10 chicane and goes straight over the second kerb - launching the Force India into the air! When the car returns to earth with a bang the left front wheel is left hanging off.
Hamilton up to second with 1:48.334, still half a second off Vettel.
Michael Schumacher, impressive in the first session, currently 12th.
And Buemi is the latest driver to brush the wall at that same point.
Liuzzi also brushes the concrete barrier with the rear of his Force India. He seems okay to continue too.
Button into fourth now, but a second off the benchmark time.
Kubica takes the Renault into fourth after Webber slotted into second, three-quarters of a second off the pace of his team-mate.
Nico Hulkenberg into fourth in the Williams, behind Vettel, Alonso and Webber.
As Vettel improves to 1:47.824 his Red Bull team-mate Webber goes third.
And Vettel has done his thang by shooting to the top of the timesheets with 1:48.559.
Alguersuari hits the wall with his left rear! Somehow he is able to continue past the pits...
Robert Kubica pops into fifth as Sebastien Buemi complains about the rear end of the Toro Rosso under braking.
Button, Sutil and Alguersuari are in between them; Sebastian Vettel comes out.
And Alonso improves further to 1:48.661 while Webber is fifth.
Alonso the latest driver to go fastest with 1:49.376.
Alonso follows the Briton, with Adrian Sutil third from Vitantonio Liuzzi.
Button leads the way now with 1:49.768.
Fernando Alonso is using the F-Duct and Massa not. The Red Bulls are the only cars still yet to come out.
Rubens Barrichello puts the Williams on top with 1:50.309. Rubber being laid down all the time.
Alguersuari top of the pops with 1:50.637 then comes in for a check over the car.
Felipe Massa third with Jenson Button fourth. And the reigning world champion moves up to second.
Seventeen drivers have posted times as they seek to take advantage of the dry conditions. No rain seems to be lurking anywhere.
Hamilton P1 with 1:51.712 from Alguersuari and Kobayashi. McLaren were running new front wings a couple of hours ago.
Kobayashi spins his Sauber but avoids the walls. It was surprising that no one damaged their car in the barriers in the first run-out.
Jaime Alguersuari posts 1:53.406, the opening timed lap.
Hamilton the first of the championship contenders to emerge. Mark Webber close behind.
Kamui Kobayashi, Robert Kubica and Lucas Di Grassi out first, followed by several other midfield and lower-ranked drivers.
There has been no further rain since the first session, but parts of the circuit are still damp. The city is dark with the route floodlit.
The session gets underway with a track temperature of around 28 degrees Celsius.
Mark Webber snatched top spot from a hardworking Michael Schumacher with his final lap of first practice.
Welcome to coverage of second practice for this weekend's Singapore Grand Prix.