Felipe Massa, Valtteri Bottas keep Williams seats for 2015 Formula 1 season

Williams have confirmed that current racing duo Felipe Massa and Valtteri Bottas will retain their places for the 2015 Formula 1 season.

Massa was already under contract for next year, while the team have taken up an option to extend Bottas's contract after an impressive season so far in 2014.

Team principal Sir Frank Williams said in a statement: "I'm delighted to confirm Felipe and Valtteri will be racing for Williams again in 2015.

"Felipe is a pleasure to work with and combines raw pace with a wealth of experience.

"As for Valtteri, we have known for many years he is a very special talent, and in the FW36 we have given him a car that is allowing him to demonstrate his skills."

Bottas currently lies fifth in the driver rankings and has 12 more points than Red Bull's reigning four-time world champion Sebastian Vettel.