Valtteri Bottas has suggested that Williams will struggle to match the pace of Ferrari in Sunday's Chinese Grand Prix.
The Finn will start from fourth on the grid, just behind Malaysian Grand Prix winner Sebastian Vettel and ahead of teammate Felipe Massa.
However, Bottas is sceptical about the Oxfordshire team's chances of beating the Scuderia to a podium finish.
He is quoted by Crash.net as saying: "I think in the race they, at least on the Friday long runs, they seem stronger than in one lap, so the tyre drop off is less than anyone else.
"We are somewhere in the average here, so it will be difficult but we are now between them and you never know what is going to happen in the race."
The second Ferrari of Kimi Raikkonen starts behind Bottas and Massa in sixth.
