A happy Nico Rosberg says he is optimistic about Mercedes' 2015 prospects after setting the fastest laps of the two Barcelona tests. Rosberg's lap of 1:22.792 was three-tenths faster than any other driver could manage over eight days at the Circuit de Catalunya. Mercedes team-mate Lewis Hamilton, his nearest challenge in the fastest laps stakes, went faster than Rosberg on the medium compound, but, perhaps more importantly, Rosberg's total lap count for the winter – 759 – didn't only dwarf Hamilton's tally of 533 but was also the most any driver in the field registered. If there's such a thing as the 'perfect winter' in F1, Rosberg has just enjoyed it. 'I'm optimistic for the...
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