Valtteri Bottas says Williams must not get carried away with thoughts of fighting for victory at the season-opening Australian Grand Prix.

Having made the switch to Mercedes engines over the winter, Williams has enjoyed an impressive pre-season which continued when Bottas completed 128 laps on the first day of the final test. Having set the second fastest time the car looks both quick and reliable, but while Bottas is targeting consistent strong points finishes this year he didn't want to set Williams too many ambitious goals.

Asked by Crash.net if it was unrealistic to be thinking of Williams as a potential race winner in Melbourne, Bottas replied: "It's too early to say.

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"Of course you always wish for it but I think it's still better if we keep our feet on the ground, keep working and then we'll see."

However, Bottas did concede that the pace Williams had shown during race simulations at the second test compared to other Mercedes-powered teams was encouraging.

"It didn't look too bad. You don't know if the others are doing much fuel saving or if they had their best bits on the car and things like that. But at least the long run lap times from the last test didn't look too bad. If that's true then I think we can really have some good competition and finally have some proper races.

"Last year sometimes we were a bit behind and between the middle teams and the last teams, but if that's true then we're going to have some really good races. But let's see when everyone puts the best bits on the car. It's still testing but it's nice to see that we are more or less there at least on testing times."

With the development race set to be crucial in 2014, Bottas said he was confident that Williams would be able to match the pace of the leading teams throughout the year.

"I really hope so, that's our goal and there's a lot of effort going in to that. The development will be very important this season, maybe more important than any other season so far for many years. So we must make sure that we're in that race also, not that we're just good in the first few races. I'm confident we can keep up; we have a stronger team than last year so I really hope so."