Hamilton: Mercedes testing form "quite clear" to read

Daniel Ricciardo was off the pace in the Renault in the opening practice session at Albert Park

But Mercedes' Hamilton won his fifth world title with two races still left.

Last season we saw Ferrari start off with a bang and they kept up with the tempo.

Mercedes struggled to find a suitable vehicle balance in the opening week and while the team's fortunes appeared to improve with a raft of aerodynamic updates introduced for week two, Hamilton suggested that the gap to Ferrari was "potentially half a second" after the final day of pre-season testing.

"We had some issues with the vehicle to fix". We got a bit lucky during the race weekend (in Melbourne) with the safety auto to grab the win.

"And we don't know how much they've improved". Our vehicle seems to work fine, there are no problems at this stage.

"The Formula 1 Rolex Australian Grand Prix is a spectacle of colour, sound and excitement, and our partnership with CHiQ enables us to deliver all the action to our hospitality guests and event patrons in crystal clear, high definition", said Andrew Westacott, Chief Executive Officer of the Australian Grand Prix Corporation.

"Naturally after a test you always improve on the next days, the vehicle gets older and older throughout the test".

"The spirit is good, atmosphere is good, happy to be here and happy to start racing".

Meanwhile Red Bull, powered by new Honda engines, have high hopes that Max Verstappen, who finished fourth in the drivers' standings a year ago, can crash the Hamilton-Vettel party.

However, Rosberg admits that Vettel needs to drive a "perfect season" from the cockpit, and fend off the challenge of his new teammate Charles Leclerc.

"Everyone takes a step after testing". Didn't seem to make a difference.

Daniel Ricciardo will also hope for better luck at his home race in the yellow and black of Renault, having missed a maiden podium in Melbourne with Red Bull previous year when he was hit with a three-place grid penalty for a minor technical infringement. The DRS is a bit different, it's a bit bigger delta so let's see.

Addressing the order of things at the Scuderia ahead of this weekend's Australian Grand Prix, Vettel declined to detail what "certain situations" could potentially involve, the German not expecting any preferential treatment this weekend.