Nico Rosberg has signed a new deal keeping him at Mercedes beyond the 2013 season, the Formula 1 team said.In a statement issued ahead of the Abu Dhabi Grand Prix, Mercedes added that seven-times champion Michael Schumacher, the most successful driver in the sport, would again be Rosberg's team mate in 2012.The team said Rosberg, who joined from Williams in 2010, had agreed "a multi-year contract extension to include the 2013 season and beyond".Rosberg has yet to win a race since his debut in 2006 but is still highly regarded.He has had three podium finishes and scored 217 points since he joined Mercedes. This season he has scored five more points than Schumacher and is seventh overall with two races remaining.Rosberg said: "To win in a Silver Arrow (Mercedes) will be one of the highlights of my life so far. MERCEDES SUPPORT"I have every confidence that the team will provide me with a winning car and that we will be able to contribute to the fantastic racing heritage of the Silver Arrows," he said.Team boss Ross Brawn hailed the German as a driver who can win races and championships and said he had already achieved "results at the very limit of the technical capabilities of our current car."Brawn said: "He has an excellent work ethic and, together with Michael, this gives us a driver pairing who consistently push the team to improve and progress."We look forward to providing Nico with a car which will enable him to compete right at the front of the field and achieve his deserved first win in Formula 1," he said.Before his long-term commitment to Mercedes, Rosberg had been one of the candidates tipped by the media as a possible replacement for Felipe Massa at Ferrari after the 2012 season.