Valtteri Bottas will remain with Mercedes for a third year in 2019, the Finn signing a one-year contract extension with the Silver Arrows squad.
Bottas, a three-time Grand Prix winner with Mercedes, has endorsed a deal that also includes an option for 2020.
"It is great news that I will be racing for Mercedes in 2019 and it is nice to announce it here in Hockenheim - not just the home race for Mercedes but also the circuit where I took my first ever single-seater wins back in 2007," said the 28-year-old.
"This year, with a full winter of preparation, I have been able to make a good step forward - and I believe that there is still more to come.
"We have not been so lucky in the races this year but the team knows how I am performing, and this is a great sign of confidence in me and my driving.
"I enjoy working with the team, and also being team-mates with Lewis - we have a good relationship, honest and straightforward, and always aiming to get the right results for Mercedes. We have a big battle on our hands right now, so it's good to have the future clear for everybody - it means we can have a full focus on the championship fight."
Mercedes team boss Toto Wolff deemed himself happy with the outfit's unchanged line-up for 2019, underscoring the harmonious relationship that prevails between Valtteri Bottas and Lewis Hamilton.
"Valtteri's performances have been excellent this season and, if not for our mistakes and his misfortune, he could be leading the drivers' championship at the moment," said Wolff.
"When we took the decision in favour of Valtteri for 2019, it wasn't just about his undoubted speed and work ethic, but also a question of character. His relationship with the team, including Lewis, is open and trusting, without any politics at all.
"Those are the ingredients you need when you're fighting strong rivals in both championships and they mirror the values inside the team.
"I am very excited to keep Valtteri in the team and look forward to celebrating many more successes with him."
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