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Felipe Nasr has ended the first morning of F1 testing at the Circuit de Catalunya with the fastest time as Lewis Hamilton was forced to withdraw after falling ill.

The Brazilian was the first driver to break into the 1min 27secs bracket in his Sauber, improving his benchmark to 1min 27.307secs shortly afterwards to ensure it was his name at the top as the chequered flag fell for an hour's break.

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He was just five hundredths quicker than Daniel Ricciardo, who made up for missing much of the morning in the pit lane by proving quick when he did eventually emerge in the Red Bull. The Australian has completed just 18 laps to Nasr's 56.

Further back, an unwell Hamilton brought his day to an end after just 11 laps when he declared he was too ill to continue in the Mercedes. As such, he will be replaced by Pascal Wehrlein this afternoon after the young German spent his morning getting acquainted with the Force India as part of the team's testing deal this weekend.

Furtehrmore, Hamilton's exit means Sergio Perez will get an earlier than anticipated run in the Force India VJM07 this afternoon as the team works on getting data on the Pirelli tyres without its 2015 car.

Pastor Maldonado prompted two red flags early on when his Lotus E23 ground to a halt, but recovered to third fastest, ahead of Max Verstappen and initial pace setter Kimi Raikkonen.

After its difficult first test in Jerez, McLaren-Honda enjoyed a far more positive morning in Barcelona, with Button briefly topping the timesheets at one stage. However, having spent the final 90mins of the morning session in the pits having completed 21 laps, McLaren was forced to call an end to its day with more technical issues.

Getting her first run in the Williams FW37, Susie Wolff was the busiest driver of the morning, completing 77 laps.