Jenson Button was fastest on the first day of testing at Jerez despite sitting much of the morning out due to technical issues.
The Briton had completed few laps when his McLaren ground to a halt due to a fuel-pump issue. Button then went on to set the fastest lap of the day in the closing minutes of the session.
Mark Webber set the second fastest time of the day however he was 0.8 seconds behind Button and had set his time on Medium tyres where as Button’s time was set on Hard tyres.
The third fastest time was set by Romain Grosjean in the Lotus with Paul di Resta setting the fourth fastest time ahead of Daniel Ricciardo in fifth.
Felipe Massa set the sixth fastest time for Ferrari whilst Nico Hulkenberg set the seventh fastest time on his first outing for the Sauber team.
Button was not the only driver to have technical issues. Nico Rosberg in the Mercedes had his day cut short after a electrical fault, he finished the day in eighth ahead of Pastor Maldonado who was driving the old-spec Williams.
The Caterham of Giedo van der Garde was 10th ahead of the Marussia of Max Chilton. Chilton’s day was cut short after the team decided to investigate an issue with the rear suspension.
It should be remembered that the times set in testing are unlikely to be a true gauge of each cars performance.