Now the real business begins, with qualifying for the Malaysian Grand Prix coming up in two hours time. Join us again then!
Free Practice 3
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Webber, Button, Heidfeld and Vettel complete the top five.
The flag is out and that's it for practice. Hamilton paces the third and final practice session.
Vettel's running quick, but he's not going to challenge the current leaders. The world champion goes fifth.
Webber now splits the McLaren pair as Heidfeld moves into fourth.
The track is filled with cars for the final five minutes, as Hamilton knocks his McLaren team-mate Button off top spot with a 1:36.340.
Button heads back to the top of the list with a 1:36.805 as things heat up in Malaysia!
Liuzzi, the only man not to have been out on track this session, finally gets his installation lap under way.
Alonso is out on softs and with just over 10 minutes remaining he goes top with a time of 1:37.284!
The track goes relatively quiet for a moment as teams prepare for final runs before qualifying on soft tyres.
Button, Buemi and Barrichello complete the top six.
Vettel then betters his own time as Schumacher slips into second. Rosberg, whose Mercedes is on softs, moves up to third.
Some teams are changing to soft option tyres, but Vettel is still on the hard compounds as he goes top of the timesheets with a 1:38.213.
Time for Button to lead the pack as the McLaren man clocks a lap of 1:38.464.
Karthikeyan returns to the track but it's not long before his car is smoking heavily again. There should be a government warning on his HRT.
Vettel on team radio: "The wing does not stall any more."
Di Resta spins again as he struggles with his grip, but again the Scot stays out on track to continue.
The Ferraris are the cars to beat at the moment as Alonso goes second quickest before Massa puts in the fastest time of the day with a 1:38.926.
The yellow flag is out briefly as Di Resta spins at Turn 15, but he carries on regardless.
And then Massa goes fifth with a 1:39.247 to announce the Ferraris' intentions.
Massa and Alonso are out on track, the latter moving into sixth place with a 1:39.407.
Hamilton still leads, ahead of Heidfeld, Button, Petrov and Vettel.
Vettel now pits so his Red Bull team can begin to have a look at his wing.
Vettel on team radio: "The (DRS) wing doesn't stall as I'd like it to stall."
So what of world champion Sebastian Vettel? He's just posted the fourth best time of the day.
And it's not long before Hamilton goes top with a 1:39.348, the quickest we've seen so far today.
Hamilton paces round and slots into P2 as Webber completes a slow first lap of the day.
The baton is passed to Heidfeld as the Renault man clocks a 1:39.426.
Here we go then. Trulli sets the pace, then Kovalainen before Petrov tops the early times with a 1:39.884.
So, the tyre of choice at this stage of the session is hard, with the softs being stored for later on.
Karthikeyan is out doing his installation lap - let's hope he can complete it.
D'Ambrosio, Petrov, Kovalainen and Trulli are the first to get going.
It's gone a bit overcast at Sepang as storms brew to the south of the circuit.
Ten minutes into the session and we're should be good to get started properly soon.
Every driver has now completed an installation lap - except, you've guessed it, the HRTs of Karthikeyan and Liuzzi.
Hamilton has a few problems with his sight in his mirror. He tells the team and they'll sort it out straight away.
Schumacher puts in a second slow tour of the circuit before pitting to leave the track empty.
And now Schumacher, Barrichello, Sutil, Rosberg and Vettel join the McLarens and the Ferraris on installation laps.
Di Resta, Perez, Heidfeld, Petrov, Alguersuari and Maldonado all hit the track early.
Here we go! Under way in Sepang!
And it's humid: 83 per cent humidity, compared to yesterday's 50 per cent.
A quick weather report - we could see a storm as some stage during qualifying today, but this practice session should stay dry. It's hot out there - around 31 degrees.
Mark Webber has been the man to beat over the two previous sessions, the Red Bull man pacing both of Friday's run-outs.
Hello and welcome to our continued coverage of the Malaysian Grand Prix, with the third and final practice session before qualifying later today.