Kevin Magnussen has emerged quickest on the third day of testing at Jerez as Red Bull's problems deepened.
Although Jenson Button drove the McLaren in the morning having missed out on Tuesday's running, Magnussen took over in the afternoon and was immediately quick. A run in the final hour of the day saw him set a time of 1:23.276 to end the day 0.4s clear of the field and 1.7s faster than his new team-mate.
Felipe Massa was second behind Magnussen on his first day in the Williams as Mercedes-powered cars filled the first four places on the timing screens.
Lewis Hamilton was third quickest on a more productive day for him in the Mercedes, though his lap tally of 62 was still 35 laps shy of Nico Rosberg's total from Wednesday. Button ended the day fourth on the timesheets and his 40 laps allied to 51 from Magnussen gave McLaren the highest total of the day.
It was a nightmare day for Red Bull, however, as it was again hit by reliability issues. Having cut day two short to ensure it was ready to run on Thursday morning, Daniel Ricciardo didn't appear until just before midday and immediately caused a red flag on his installation lap. After quickly rejoining the action, Ricciardo managed two more laps before pitting and the Red Bull didn't re-emerge, leaving the team with a total of 14 laps over three days of testing.
On his first day in the new Ferrari, Fernando Alonso stopped out on track in the morning but still completed 58 laps and set the fifth-quickest time, 2.2s off the pace of the McLaren. Nico Hulkenberg's return to Force India also saw him cause a delay when a fuel supply issue stopped him on track and he only managed 17 laps throughout the day.
Toro Rosso managed to get some track time after completely missing Wednesday's running, but Jean-Eric Vergne twice stopped late in the day at the pit exit; once having just completed a lap and once after leaving the garage.
Adrian Sutil had completed 34 laps when his day came to an abrupt end as he crashed in to the barriers between turns 6 and 7, damaging the front of the car. Robin Frijns did 10 laps for Caterham without setting a time as issues for Renault-powered cars appeared to continue.
There was positive news for Marussia as the MR03 finally broke cover and Max Chilton completed five laps in the final two hours of the day to give the team some initial data ahead of the final day's running on Friday.
To view the results from day three at Jerez CLICK HERE