That's the end of the session. Webber takes the spoils, but it is all about qualifying, and you can follow that with us at 15:00 Uk time - don't miss it!
Free Practice 3
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Webber is fastest with a 1:46.081 - last knockings now...
Massa goes just eighth, but he will have time for one more quick lap if he fancies it.
That's a bit better from Hamilton, going fifth with a 1:47.085. And Jaime Alguersuari goes airborne through the chicane! Spectacular, but not necessarily the quickest way round...
Weirdly, Hamilton is still seven seconds off the pace and he is still way down in 19th...
And quicker from Jenson Button - 1:46.108.
Strong lap by Alonso on the option - 1:46.452.
Rosberg is two tenths behind Vettel after sector two - and he slots into second place. But he is still seven seconds behind Vettel despite using faster tyres!
Nico Rosberg on the super-soft tyres, looking to leap up the timesheet from eighth place.
Lewis Hamilton is down in 18th place - he has done 14 laps and is seven seconds off the pace. We have to assume he is working on his race set-up.
Not too much action out on the track as the drivers prepare to run on the super-soft option tyres. Those are the ones with red colouring on the tyre wall.
Good pace from Michael Schumacher, who is up in second on 1:47.837.
And here come the option tyres! Williams pair Maldonado and Barrichello are the first to try them on for size.
A familiar name pops up at the top of the leaderboard - Sebastian Vettel with a lap of 1:47.737.
Webber goes P3 - nobody has yet come out on the super-soft option tyres that will be used in qualifying.
How they stand: 1-Button, 2-Alonso, 3-Rosberg, 4-Sutil, 5-Schumacher, 6-Di Resta, 7-Barrichello, 8-Maldonado, 9-Petrov, 10-Perez.
Button continues to lead the way here, clocking a 1:48.421 ahead of Fernando Alonso who has been pretty quiet so far this weekend.
Pastor Maldonado is dawdling along and gets in Michael Schumacher's way - Schumi finally gets past and gives him a choice hand gesture as he does so!
Following yesterday's shambles in practice, the kerbs have been upgraded. There were issues at turns 3, 7, 10 and 14 yesterday.
Jenson Button goes fastest - 1:50.707 from the McLaren man.
Ooohh... Sergio Perez takes a huge chunk of kerb and bounces his way round the left-hand corner. That will give him and the car a real shake-up.
Hamilton bumps his way over the chicane and comes through in 1:55.324. Quickest at the moment is Kamui Kobayashi in 1:52.574.
Lewis Hamilton is out on track 0 he said last night he fears
Jerome D'Ambrosio is the only man on the track, and he runs very wide as he attempts a flying lap. He comes through in 2:01.917. Very slow, even by Virgin standards.
Every single driver has now completed an installation lap - no flying laps yet.
Lots and lots of cards have gone straight out onto the track for installation laps. Only Button and Vettel have yet to come out.
It is a sweltering 31C, but the track is not much warmer, just 35C. It's not sunny, just muggy.
The session is under way on another warm early evening in Singapore!
Welcome to live coverage of the final free practice session ahead of the Singapore GP from the Marina Bay street circuit.