Third and final day at Circuit de Barcelona-Catalunya
Two sessions: 08:00-12:00 & 13:00-17:00 (GMT)
Haas - who have Russian-based sponsor - run all-white livery
Lando Norris fastest on Wednesday, Charles Leclerc quickest on Thursday
Time for us to wrap things up for today but you can read all about how the final day of testing unfolded below, and watch out for Andrew Benson's full analysis of the first test on the BBC Sport website later this evening.
See you later!
Image source, Getty ImagesLewis Hamilton ends the first pre-season test fastest - but his Mercedes team-mate George Russell says not to read too much into the times.
Read Andrew Benson's full report.
Lewis Hamilton ends the first pre-season test fastest - but his Mercedes team-mate George Russell says not to read too much into the times.
Read MoreChris Medland
F1 journalist in Barcelona
Lewis Hamilton was looking for lap time in those closing stages, with multiple runs on the C4 and C5 compound that saw him go to the top of the times. But he still kept something in his pocket, backing off at the end of his final lap of the test when he was set to improve once again. He officially posts a fastest time of 1:19.138, but his three best sectors add up to a 1:18.629.
Lewis Hamilton (Mercedes) – 1:19.138– 94 laps
George Russell (Mercedes) 1:19.233 – 66 laps
Sergio Perez (Red Bull) – 1:19.556 – 74 laps
Max Verstappen (Red Bull) 1:19.756 – 59 laps
Sebastian Vettel (Aston Martin) 1:19.824 – 48 laps
Charles Leclerc (Ferrari) 1:19.831 – 44 laps
Carlos Sainz (Ferrari) – 1:20.072 – 92 laps
Alexander Albon (Williams) 1:20.318 – 94 laps
Nicholas Latifi (Williams) 1:20.699 – 13 laps
Daniel Ricciardo (McLaren) – 1:20.790 – 86 laps
Lando Norris (McLaren) 1:20.827 – 52 laps
Fernando Alonso (Alpine) 1:21.242 – 12 laps
Guanyu Zhou (Alfa Romeo) 1:21.939 – 41 laps
Pierre Gasly (Alpha Tauri) 1:22.469 – 40 laps
Nikita Mazepin (Haas) 1:26.229 – nine laps
Valtteri Bottas (Alfa Romeo) – 1:30.433 – 10 laps
*Times in bold from the afternoon
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Lewis Hamilton had sneaked in one more quick lap for good measure, so finishes testing top of the order with 1:19.138.
That's it. The final day of testing draws to a close with Lewis Hamilton topping the timesheet ahead of Mercedes team-mate George Russell.
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Here he is!
Lewis Hamilton goes fastest of all with 1:19.141. He's not going to be far off 100 laps for the day as well when testing comes to an end soon.
Chris Medland
F1 journalist in Barcelona
As the test winds down, there are still plenty of interested observers in the pit lane. Pat Symonds has been checking out the updates teams are bringing, because the rate of development is so big. There’s also a lot of head scratching going on from different teams, who say they are struggling to understand exactly what the potential of their rivals is because performances have been fluctuating.
Image source, .Sergio Perez gets to within three tenths of George Russell's time as he does a 1:19.556.
Lewis Hamilton is also into the 1:19s with 1:19.674.
Chris Medland
F1 journalist in Barcelona
Not long left for teams to gather the data they’ll be studying back at their respective bases for the next two weeks before the second test in Bahrain. For some there’s pit-stop practice and long running.
Others, like Red Bull, are heading out to try some softer compounds. Sergio Perez hasn’t had a huge amount of running this week, but he returns to the pits for a front-wing adjust and to simulate a race start from the end of the pit lane.
Image source, .Into the final half-hour and there are not a lot of cars on the track. Lewis Hamilton and Carlos Sainz have both found a tiny bit more time on their latest laps.
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Is Lewis Hamilton pushing for the fastest time of the week? He's just clocked a personal best with 1:20.410.
Image source, Getty ImagesThis is your penultimate timesheet of the week...
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Carlos Sainz clocks a personal best with 1:20.883 and he's currently P10 with 64 laps under his belt.
Lewis Hamilton is the mileage king today, however. He's done 71 this afternoon and still going.
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