Despite Williams locking out the second row of the grid for the United States Grand Prix at the Circuit of the Americas, Valtteri Bottas is not assuming that he can to his podium collection.

The Finn out-qualified team-mate Felipe Massa to claim third place on the grid - and a beneficial spot on the 'quicker' side of the grid, but explained that he was expecting a pressure-filled afternoon on raceday.

"It was a pretty good qualifying again, and I'm really pleased with the couple of good laps I got in Q3, but it's been a difficult weekend from my side for some reason. [I struggled] to get a good rhythm and then finally trust the car like you should, so I'm really happy for us as a team.

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"We locked [out] the second row and that's a good starting position for tomorrow's race because we still have three important races to try and keep a good position in the constructors' championship. But it should be an interesting race, especially as the guys behind us will be really quick. It will be an important race for us to get good points, but it's not going to be easy."

Asked how he managed to overturn Massa's early advantage in the Williams camp this weekend, Bottas pointed to a lot of hard work with his engineers.

"I managed to improve a lot from practice, and really got a good set-up on the car ahead of qualifying," he explained, "I could really trust the car and get the lines right, get every corner right. I knew that Q3 is the one that was going to matter and I needed to get everything right and be on the limit then. I tried to squeeze everything that there was."