Barcelona: Valtteri Bottas was fastest for Williams on the final morning of pre-season testing in Barcelona as McLaren's reliability problems continued.
Ferrari's Sebastian Vettel was second quickest with Felipe Nasr in third.
However, McLaren's inability to put their MP4-30 through its paces ahead of the opening Grand Prix of the season in Melbourne in two weeks' time continued as Jenson Button could only muster two installation laps without registering a time before lunch.
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