Hello and welcome back to our live coverage of the Australian Grand Prix at Albert Park in Melbourne with the third free practice session.

Qualifying is up next. Be sure to join us again for that one as 2011 season's opening race draws nearer!

So, Vettel paces the third practice session, ahead of team-mate Webber and the McLaren pair of Hamilton and Button. No surprises there. Petrov in fifth ahead of Alonso, Kobayashi, Rosberg, Heidfeld and Schumacher.

Button is still out there and he moves up to fourth.

Things are heating up as the final practice session nears an end! Vettel, Webber, Hamilton, Petrov, Button, Alonso, Kobayashi, Roberg and Heidfeld with less than two minutes remaining.

Vettel proves just how quick the Red Bull car is with a barnstorming 1:24.507! That's quick from the defending world champion!

Vettel's best time was done on the harder tyres...

Webber looks quick in the first sector... he's a tenth off in sector two... and he can't better Vettel's time.

Bad news for Williams - it seems that there is an oil leak in Barrichello's gear box, which are not expected to last five races.

But that's a better from Massa as he rises to seventh, despite what looks like a loose camera fitting on his cockpit.

Massa's struggled so far today - he's down in 15th and far from showing the form of his team-mate Alonso.

So, the Red Bulls and McLarens with Alonso's Ferrari occupying the top five again now.

Here's Hamilton looking to improve on the softer of the two Pirelli tyres... he's using the DRS to good effect and he takes third with his best lap yet!

Vettel goes to the top of the standings with the fastest time of the weekend so far! 1:25.327 is the time to beat now. Button, Alonso now and Webber complete the top four. Buemi is a surprise entry in fifth, ahead of Petrov in sixth.

Perez seems to have a problem as he limps into the pit lane at a snail's pace. Hamilton has to be aware not to slam into the back of him as he enters!

Time now for Button to put in a quick lap - 1:25.961 - to go top. Hamilton up to seventh with a 1:27.796...

The top of the order is beginning to adopt a familar feel now as Red Bull's Webber goes top with a 1:26.993. Team-mate Vettel is second, followed by Mercedes' Rosberg and Button. Hamilton down in 15th at the moment.

So, Vettel, Rosberg, Button, Petrov, Webber and Heidfed lead the way so far during this third practice session.

Paul di Resta goes a little wide as he looks to get to grips with the Albert Park circuit on his F1 debut.

Just half an hour remaining before the real serious stuff starts!

World champion Vettel posts a 1:27.337 to go top for the moment.