Felipe Massa doesn't expect Williams to be able to put Mercedes under pressure in the United States Grand Prix.

With team-mate Valtteri Bottas qualifying third ahead of Massa in fourth, the two Williams cars are well placed to challenge the Mercedes' ahead. However, despite encouraging long run pace on Friday, Massa says the advantage Mercedes held in qualifying is likely to translate in to similar dominance in the race.

"I cannot see that they are one second quicker than us in qualifying and then we are the same in the race," Massa said. "Honestly, I don't believe that. But you never know, maybe you can have an opportunity when anything can happen with Mercedes. Talking about the opportunity will be OK, but I don't think we will be very close to them tomorrow."

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However, Massa is confident Williams will retain its place as the second quickest team over the race distance.

"I think so. I saw that the degradation on the Red Bull was quite good so this is something where we maybe need to be careful that they are not better than us on the tyres tomorrow but I think we can still be competitive."

With both he and Bottas potentially going to be clear in of the cars behind but unable to race Mercedes, Massa said he has no problems with team orders ensuring the cars are safely brought home.

"It depends on the pace. If the car behind has a much quicker pace I don't think it will be a problem for the team to even ask the driver. We know what we need, we need to have that in our minds. We need to understand what we need and what is important for us. Always the start is the most dangerous place which I hope we can do everything right."