Nico Rosberg will remain at Mercedes for at least another two seasons, the team has confirmed.
A new “multi-year contract extension” was announced by Mercedes on Wednesday.
Rosberg, who joined the team in 2010, said: “It has been a difficult road to get to where we are now – but everybody kept believing and, thanks to the fantastic support from Mercedes-Benz, we are now leading the way in F1.”
“There has been big progress during the past year, building up our structure, management and capability for the future. We have an awesome team and I am confident that we have the right people in place at every level.
“I’m looking forward to the next years together, when we will keep pushing to win even more races – and, hopefully, championships.”
Rosberg scored his first win with the team at Shanghai in 2012. He has already won three races this year and currently leads the championship by four points over team mate Lewis Hamilton.
“Nico has been part of the Silver Arrows project since day one and he has a big stake in the development of the team since 2010,” said Mercedes’s head of motorsport Toto Wolff.
“His speed, commitment and focus have all helped to give clear direction and to drive the team forward. With his performances in 2014, Nico has demonstrated to the outside world what we knew already in the team: that he is one of the very top drivers in Formula One.
“This new contract brings us important stability and continuity for the future and I am delighted to be able to make the announcement in time for the home race of Mercedes-Benz and Nico in Hockenheim.”
View the updated list of 2015 F1 drivers and teams
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