Felipe Massa has conceded that Williams's best chance of finishing on the podium in 2014 may have gone.
Williams impressed the Formula 1 paddock in pre-season testing but Massa was eliminated at the first corner in Australia before driving to seventh place in Malaysia and Bahrain.
"In Australia I did not race so I lost my big chance to be on the podium," he said. "I hope we are going to have another chance.
"[In Bahrain] I was fighting for third place the whole race and then we had the safety car and I went from third to eighth. Without the safety car we were able to finish in front of both Red Bulls and maybe one Force India. I'm not sure about both because they were doing two stops anyway. Strategy was something where [Sergio] Perez was better than us, but there was definitely a chance for the top five."
Massa believes that Williams can make progress this weekend, with the focus being on improving front tyre wear.
"I think the problem we've been having since the first test is that by putting more stability on the rear of the car, it's normal that we use a bit more tyres," he said. "We have some new pieces for this race, which I hope everything works, and if it does I think we will see an improvement on the car.
"We didn't have so many new pieces in the last race and other teams did so we saw more improvement in the last race. I think we will see a similar improvement on our side if we can use everything we are trying."