Mercedes team boss Toto Wolff said prior to the summer break he had a tough decision to make between Bottas and Ocon but suggested the harmony its current pairing had created was crucial to its high level of performance and recent success.
“For 2019, we set Valtteri the challenge of coming back even stronger than we saw him in the first part of 2018 – and he has achieved that, with some really impressive performances in the early races this year,” Wolff said.
“Although it has been his most successful first half of a championship so far, he is hungry for more and determined to keep on improving and raising his level.
“The results we have achieved together with Valtteri are no coincidence: he has been an integral part of our championship success in the past two seasons, his teamwork with Lewis has been exemplary and he has shown real strength of character in how he has responded to setbacks.
“I’m delighted that he will stay with the team for another season at least – and look forward to seeing him raise the bar even further.”
Bottas joined Mercedes in 2017 after the shock retirement of Nico Rosberg.
Since then, Bottas has won five races while partnering Lewis Hamilton at the team and has helped Mercedes to two further constructors’ titles.