Postpublished at 15:02 Greenwich Mean Time 3 February 2015
Pastor Maldonado is still out there, along with Carlos Sainz Jr, Felipe Massa and Daniel Ricciardo.
Nasr takes Sauber to the top of the timesheets
McLaren get mileage but end the day early
Nasr spins, bringing out first red flag of the day
Rosberg stops on track
Lotus hampered by telemetry trouble
Eight teams in action, with Force India absent
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Lawrence Barretto
Pastor Maldonado is still out there, along with Carlos Sainz Jr, Felipe Massa and Daniel Ricciardo.
Fernando Alonso:, external Big step forward... #McLarenHonda #proud #Progress
F1 journalist Dan Knutson in Jerez: "Work has been going on behind the screens in the Red Bull garage for most of the day.
"With Daniil Kvyat doing 18 laps yesterday and Daniel Ricciardo doing just 12 so far today, it really has been a couple of wasted days for the team as far as getting mileage on the car is concerned."
Pastor Maldonado goes fourth quickest for Lotus with a 1:22.950, 1.4 seconds off the pace set by Felipe Nasr in the Sauber.
Here are the day's headlines:
McLaren end day early because of power unit problems, but they managed 32 laps
Felipe Nasr sets the pace for Sauber after track dries in Jerez
Nico Rosberg clocks 120 laps, but loses time after stopping out on track
Nasr spins, bringing out the first red flag of the day
Lotus delayed because of telemetry issues
Red Bull endure tough day with limited mileage after engine change
Want to know what the new McLaren-Honda sounds like? Thought you would. Click here to hear a comparison between that and the Mercedes.
Hurrah, Ferrari fire up their car and send Kimi Raikkonen on his way, with Nico Rosberg and Felipe Massa following him down the pit lane.
The track falls silent.
Red Bull:, external Hitting all the notes, just not necessarily in the right order... That's testing!
Lotus are having an encouraging day with Pastor Maldonado passing his half century of laps before heading back to the pits for a few tweaks to the car.
Williams:, external Felipe reports the track is improving as he completes an eight lap run, taking his total to 47 for the day.
With two hours to go, Felipe Nasr heads the timesheets with a 1:21.545, 0.8 seconds clear of Kimi Raikkonen's Ferrari. Mercedes' Nico Rosberg is third, four tenths adrift.
Felipe Massa is fourth, ahead of Daniel Ricciardo, Pastor Maldonado, Carlos Sainz Jr and Fernando Alonso.
F1 journalist Dan Knutson in Jerez: "Like the rest of the teams, Williams plan to put a number of upgrades on their car. Williams will run their Australian Grand Prix spec car, or something very close to that version, at the last pre-season test.
"'We are going to see changes between now and Melbourne,' chief technical officer Pat Symonds said. 'You will see them in the final days of the final Barcelona test.'"
But back comes Felipe Nasr, the Sauber driver clocking a 1:21.545 to bump Kimi Raikkonen down to second. We shouldn't read anything into this really, as we don't know what fuel loads they're running while different tyre compounds will also have an affect, too.
It's straight down to business for Ferrari's Kimi Raikkonen as the Finn pumps in a 1:22.351 which sends him flying to the top of the timesheets.
Break over at Ferrari as Kimi Raikkonen heads back out on track, with Williams' Felipe Massa and Sauber's Felipe Nasr for company.
Nico Rosberg's Mercedes spent some time on the back of a truck earlier today when the engine broke down during the German's run.
Sauber's Felipe Nasr lowers the benchmark to a 1:22.750 to knock Nico Rosberg down to second on the timesheets.
Looks like Red Bull have finished work on the car as Daniel Ricciardo is in the cockpit and raring to go. The Australian has only managed five laps today.
Nico Rosberg reaches his century of laps and he pumps in a 1:22.810, the first driver to get down into the 1m22s today, to go fastest. Sauber's Felipe Nasr drops to second, 0.944 seconds adrift.