Bottas puts Williams on top on final day of pre-season testing

Valtteri Bottas signed off the 2015 pre-season in style by going fastest for Williams on the final day of testing at Barcelona on Sunday. The Finn hit the front early and was never deposed, as a qualifying simulation on Pirelli's supersoft tyre yielded a 1m 23.063s - which left him almost half a second clear of the chasing pack

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