Sutton Images Enlarge Despite Mercedes' impressive pace and reliability during pre-season testing, Nico Rosberg said a problem on Thursday is proof that his team still has a "massive challenge" ahead of the first race in Australia. The first day of the final test came to an early end for Rosberg due to a number of small problems, but he still managed 89 laps in total. He said the issues were proof that even Mercedes, which has completed more laps than any other team during pre-season testing, still has work to do. "That was not a fantastic day for us," Rosberg said. "We tried some new parts on the car and you find out a lot through doing that. But unfortunately we...
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