Valtteri Bottas believes "Austria was maybe a one-off" for Williams after challenging Mercedes for victory.

Felipe Massa qualified on pole position ahead of Bottas in an all-Williams front row in Austria, with the pair leading the race for the first stint. While Massa faded, Bottas kept the pressure on the two Mercedes cars and finished eight seconds behind race-winner Nico Rosberg, but he conceded that he is not expecting a repeat performance at the British Grand Prix this weekend.

"I think overall Mercedes has been performing really, really strongly," Bottas said, "It's been difficult to keep up with them in most of the races - I think Austria was maybe a one-off, we will see. We know that we have been improving but you expect everyone else to do as well. It's difficult to say. I think this season, we are going to see, the rest of the season, it's going to vary quite a bit the performance between us and them, so we will see. We will do our best."

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And Bottas says Williams will come in to the British Grand Prix full of confidence as he believes it came close to maximising its potential in Austria.

"Well, we're definitely happy with the result we got - third and fourth, a lot of points for the team, that's the main thing. I think it's like every race, always if you look into the fine details you can always something, maybe, you could have done better. But the main feeling is very positive.

"It's really good to continue from here. There have been many opportunities we could have done a lot better in previous races and now we've done a solid job, so that's good to see. We know we can do it, so it's good to continue from here."