Mercedes team boss Nico Rosberg says Brawn not to blame for problems . Seven -time world champion retired in 10th race of his F1 comeback in Melbourne . We 've achieved a reasonable set of results which are in line with the car 's current pace , but we have to be realistic and acknowledge that we are not quick enough to compete right at the front at the moment . Nico Rosberg expects the 41-year-old to keep showing improvement in Chinese Grand Prix . German has been outperformed by young teammate Nico Rosberg so far this year .
Mercedes team boss Nico Rosberg says Brawn not to blame for problems . Seven -time world champion retired in 10th race of his F1 comeback in Melbourne . Nico Rosberg expects the 41-year-old to keep showing improvement in Chinese Grand Prix . German has been outperformed by young teammate Nico Rosberg so far this year .