Ferraris' Sebastian Vettel has said he fears it might be 'tough' for anyone to stop Mercedes romping to victory in Brazil this weekend. The world championship team came out top in both of Friday's free practice sessions. Lewis Hamilton set a new track record in the morning with his lap of 1:09.202s, just ahead of his team mate Valtteri Bottas. Vettel's best time of the day was 1:09.875s, set after lunch. "Mercedes looked very strong," Vettel said at the end of the day. "I think they are a bit ahead, both of them. "It will be tough to beat Mercedes as they look very, very quick in all conditions, and on all tyres." Vettel suggested that Ferrari would have to settle...
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