Williams were once again the "best of the rest" in qualifying at the Chinese Grand Prix on Saturday, but Valtteri Bottas admits they need to work on their race pace.
Having finished the 2014 season as the second fastest team behind Mercedes, Williams have slipped back, especially in qualying as they found themselves behind the likes Red Bull and Toro Rosso last time out in Malaysia.
However, they hit back strongly at Shanghai with Felipe Massa fourth fastest and Bottas just behind him.
The Finn, though, says he had one or two issues during the final qualifying session.
"It was quite a close qualifying, although I suffered with the rear of the car throughout the final session, which made it a bit harder," Bottas said.
"We know we need to work on our race pace, but we should be closer than we were in the first two races. The cars in front look strong so we have to concentrate on tyre degradation."
Both Williams cars will start ahead of the Ferrari of Kimi Raikkonen, who was only sixth fastest, and Massa hopes they can push on on race day.
"I am really happy with my lap. I managed to get the best out of the car and showed we are still in the fight with Ferrari," he said.
"The car has improved throughout the weekend and we had the set-up correct for qualifying. Tomorrow is when it really counts so I hope we can have a strong race and get the most points on offer from the car."