Valtteri Bottas has signed a new contract with Mercedes to race for the Formula 1 world champions in 2018.
The Finnish driver joined Mercedes on a one-year deal in January 2017, as a replacement for retired world champion Nico Rosberg.
The 28-year-old is third in this year's drivers' championship with two wins from 13 races. Team-mate Lewis Hamilton leads the standings.
Bottas is in his fifth season in F1, having also driven for Williams.
"When the team hired me for the 2017 season, they took a leap of faith by putting their trust in my skills," said Bottas.
"This new contract shows that I've earned that trust."
Prior to joining Mercedes, Bottas had never won a race and had achieved nine podium finishes, a figure he has already matched this season.
Mercedes boss Toto Wolff said: "Bottas' upward trajectory made it a no-brainer for us to continue with him into 2018.
"The chemistry and dynamic between Valtteri and Lewis works and are what we need to take the fight to our competitors."