Rosberg sure of positive GP weekend

Rosberg has scored just 3.5 points so far this year, despite impressive showings in practice sessions and in qualifying.

The German, who believes his team is fourth quickest, was again in top form on Friday in Bahrain, finishing fastest of all in the afternoon.

Now the Williams driver is confident he will be able to give his team the points it deserves given the car's potential.

"You can only ever compare your performance to other race weekends so, relatively, I think we are looking okay," said Rosberg. "We've done a lot of set-up work today and I am quite happy with everything so we've made good progress.

"The team brought some new parts to Bahrain and they seem to be working well so thanks to our aero guys for their continuing hard work in developing the car.

"I am really convinced that we will be able to do something positive at this race and to get the points that the car is worth."

Kazuki Nakajima finished as 10th fastest, the Japanese admitting he was just lacking speed compared to his team-mate.

"Today didn't go too badly but we are lacking some pace compared to Nico," he said. "I'll now de-brief with my engineers to try to find out where I'm losing that time so I can make it up in tomorrow's qualifying.

"The circuit is getting better and better the more laps we do, which is good. It's also really hot out there, but fortunately it's bearable."