Mercedes team boss Ross Brawn believes his outfit have the best driver line-up in Formula 1 in Lewis Hamilton and Nico Rosberg. The Brackley-based team signed Hamilton to replace seven-time world champion Michael Schumacher alongside Rosberg. Though the car struggled to score points towards the end of last season, Mercedes have shown good pace in testing. Rosberg set the fastest time of winter testing in Barcelona, with Hamilton clocking the third best. And Brawn believes Rosberg, who made his debut for Williams in 2006, has stepped up his performances after spending three years as Schumacher’s team-mate. “If we are honest, More…