Lewis Hamilton set the fastest time on the first morning of testing in Spain as rain led to a shortened session.

Mercedes unsurprisingly set the pace during a productive morning, with Hamilton completing 27 laps and setting a best time of 1:44.291 on the intermediate tyre. With the track already wet from the start of running, further persistent rain ensured it stayed that way throughout the morning. With the forecast set fair for the afternoon, the lunch break was brought forward by an hour to 1200 to allow an elongated afternoon session running from 1300-1800.

Felipe Massa was second quickest for Williams, setting a best time of 1:45.089, which he threatened to lower during a number of laps late in the morning as Massa often set the fastest first sector. Just 0.151s slower than Massa was Sebastien Buemi in the Red Bull, driving the RB10 on track for the first time.

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Jenson Button was fourth fastest for McLaren as it tests a number of new parts, with his best of the morning being a 1:46.891. Nico Hulkenberg completed only four laps in the morning session but set his first time as the chequered flag fell and was fifth quickest just 0.097s slower than the McLaren.

Max Chilton set the sixth fastest time for Marussia, but caused one of four red flags when he stopped at Turn 5 after an hour and a half of running. Jean-Eric Vergne was responsible for two of the others, stopping on his first lap between Turns 9 and 10 and then only making it as far as Turn 4 on the second lap.

Ferrari has Kimi Raikkonen driving on both days but he completed only two laps in the opening three hours as he too stopped out on track on his first run. Raikkonen was one of three drivers not to set a time, along with Vergne and Charles Pic in the Lotus.