Valtteri Bottas topped Mercedes team mate Lewis Hamilton as running commenced in Mexico, ahead of Sunday's Mexican Grand Prix. The 90 minutes practice session unusually saw Mercedes use the softest compound tyre, contrary to rivals Ferrari and Red Bull Racing. The deficit of both Red Bulls was small enough to realistically expect another closely fought weekend. In fact, their deficit to Bottas is about the same, or less than the prediced delta between Pirelli's ultrasoft and supersoft tyres. Ferrari was slightly further behind, but even then, still fairly comfortably 5th and 6th fastest. Home racer Sergio Perez ended up 7th fastest, 3 tenths behind the slowest Ferrari, and a tenth faster...
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