Valtteri Bottas is satisfied that the revised Williams is a 'step forward' after giving it its first on track run during free practice for the Austrian Grand Prix.

The FW37 features a revised aero package from this race, with Bottas declaring before the weekend that he expects it to be an improvement in the car he took to the podium in the Canadian Grand Prix.

It would duly prove to be the case in the Finn's eyes, Bottas adding that he was particularly pleased with the long run pace.

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"I think we've made a step forward," he said. "Everything works really as expected. The final option run with low fuel was slightly disturbed with some problems that we're still investigating.

"It was pretty good with the primes as well as during FP1. The long run seems to be quite good even though I had a lot of traffic, but the pace was not too bad."

Indeed, Bottas even goes as far to say Williams can potentially cause another upset in qualifying, just as it did last season when it locked out the front row with Felipe Massa on pole.

"I think we'll be really close, I think definitely we're going to be closer to the front as any other race before. That's what I think and hopefully we'll be pretty close to Ferrari and fighting for the top three in qualifying, which I think should be a good target."