McLaren driver Jenson Button holds the fastest time on the first day of testing in Barcelona this week. The 2009 world champion used the supersoft tyres for a 1:23.753. Sebastian Vettel is in second place, only one tenth shy of Button's time. Williams used this morning to prepare itself for the 2017 downforce levels, running tusks on the nose and a double rear wing.
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Very strong performance, JB, Good job!