Mercedes driver Nico Rosberg insisted he was disappointed with qualifying for the Australian Grand Prix, despite securing sixth on the grid at Albert Park.

The German had run solidly during Friday practice and was fifth in final practice on Saturday morning.

Heading into qualifying, Rosberg was hopeful of replicating his practice form but lost time on his quickest lap in Q3 and had to settle for sixth as a result.

However, the former Williams man insisted that - despite the disappointment - he was confident of a stronger showing on race day.

"It was a disappointing qualifying today as I had made really good progress during practice with my engineers but didn't do the best job when it mattered," he said. "I made a couple of mistakes on my best lap on the option tyres, which cost me three or four tenths.

"There was more in the car today so it's always frustrating when you don't get the most out of it. It's not typical for me to make such mistakes in qualifying. But that's the way it goes sometimes and sixth position is still a good place to start. We should be stronger in the race and anything can happen tomorrow."

While team boss Ross Brawn admitted that fighting for the top three might have been difficult, he insisted that that Rosberg and team-mate Michael Schumacher - who starts seventh - could have qualified higher, although he conceded there was still plenty of work to do.

"Whilst we weren't necessarily able to compete with the top three, I thought we might have done a bit better today, and certainly be fighting for fourth and fifth places," he said. "We didn't really seem to get smooth runs and whilst it's the same for everybody with the conditions and traffic, the little things just didn't quite come together for us today.

"The car is good so we're a little disappointed but we know what we've got to do. We've got to find some time to compete with the guys in the top two or three positions and that's our objective."