Formula 1 world champions Mercedes pounded out the laps while Ferrari went fastest and rivals Red Bull and McLaren hit immediate setbacks as Formula One's new crop of cars made their test debuts on Monday. Valtteri Bottas, replacing retired world champion Nico Rosberg at Mercedes alongside Lewis Hamilton, had completed well over a race distance by lunchtime with 79 timed laps of the Circuit de Catalunya. Ferrari's Sebastian Vettel, a four times champion with Red Bull but without a win last year, was fastest in the sunny opening session with a lap of 1:22.791 seconds and 62 laps to his credit on medium tyres. The German's time was already close to the fastest lap in 2016 Barcelona testing...
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