Valtteri Bottas feels Williams still has the potential to improve even further in 2015 having already made a huge step forward in form this season.

A year on from when just a points' finish around the Circuit of the Americas was cause of celebration, the Finn has since emerged as a regular front runner in the considerably more competitive Mercedes-powered FW36 in 2014.

Already a five-time podium winner and in contention for fourth in the overall standings, Bottas admits it has been a spectacular turnaround over the last twelve months, even if he remains certain that Williams still has the capacity to achieve more in 2015.

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"I have really good memories from here, but what a twelve months it has been," he said. "It has been really good for us, we have been improving step-by-step and now we are in a really good position.

"I do think we can still improve, that is the goal. We aim to do even better than this season and I am sure it is possible."

Reflecting on the weekend ahead, though Bottas admits Williams is unlikely to take the fight to Mercedes as convincingly as it did in Russia, he is confident he can have the measure of Red Bull and Ferrari.

"I think we can be strong here. It may be difficult to be as close to the Mercedes as we were in Sochi but we should still be good. We should have a good fight with Red Bull and