Jenson Button has conceded McLaren will find it difficult to repeat their result from Sochi in Austin this weekend, with the Briton's own chances already compounded by a five-place grid penalty.McLaren have headed into the US-Brazil double header on the back of their strongest form since the first race of the season, the team having overtaken Force India in the Constructors' Championship thanks to 32 points compared to their rivals' six over the last two races.At the Circuit of the Americas on Friday McLaren started strongly, finishing third and fifth-fastest in morning practice, however slipped off the pace in the afternoon on the soft tyres amid increasingly blustery winds in the Texan...
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