Barcelona F1 test two day three
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Welcome back to Live for the penultimate day of testing.
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So what are we looking for today?
Ferrari needs to get Leclerc a decent day's work after he managed just one lap following Vettel's crash yesterday morning.
On top of that, Leclerc lost running on Tuesday while Ferrari checked its cooling system.
Ferrari needs to get Leclerc a decent day's work after he managed just one lap following Vettel's crash yesterday morning.
On top of that, Leclerc lost running on Tuesday while Ferrari checked its cooling system.
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More on that Leclerc running here, as Ferrari alters its schedule 
Mercedes managed to make up good ground yesterday, giving Hamilton a full race simulation in the afternoon after Bottas clocked 75 laps in the morning.
Running its Australian GP-spec car, Mercedes is beginning to get back to its usual testing form after a shaky start by its own high standards.
Running its Australian GP-spec car, Mercedes is beginning to get back to its usual testing form after a shaky start by its own high standards.
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The midfield battle is continuing to fascinate and its still tricky to pick out who's the leading contender.
Renault focussed on its long run programme yesterday while its rivals managed to go for red-walled performance runs late in the afternoon.
It sounds promising at Alfa:
Renault focussed on its long run programme yesterday while its rivals managed to go for red-walled performance runs late in the afternoon.
It sounds promising at Alfa:
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But over at Williams it's still an uphill battle for the team that looks firmly at the back of the grid.
Kubica and Russell have managed a good number of laps this week, but Williams is still playing catch up.
Kubica and Russell have managed a good number of laps this week, but Williams is still playing catch up.
All that and more is covered in our recap of yesterday's action.
Watch below
Watch below
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As we await the first laps from the teams, why not catch up on our Technical Editor Jake Boxall-Legge's analysis of 'size zero' car packaging: 
Green flag
Green flag at the end of the pitlane. The penultimate day of pre-season testing is underway!
Norris, Russell, Magnussen and Albon all head straight out.
Hulkenberg and Stroll swiftly follow suit.
Norris heads straight onto a flying lap on the softest C5 compound.
Magnussen heads straight back in after a standard first lap on inters, while Russell, Albon, Hulkenberg and Stroll are also back in.
Norris is also heading back to the garage after that extra lap.
Hamilton heads out on the mid-range C3 tyre. He's also got one of those trusty aero rakes fitted to the left-hand side of the Mercedes, behind the front tyre.
Hamilton does go round for a second lap, heading past us along the main straight at a constant speed.
Stopwatch
We have a first time on the board - but don't get too excited. Hamilton's first timed run is a 2m01.389s.
Gasly has joined Hamilton out on track, and out-does the Mercedes driver in the aero-rake stakes by two to one.
Giovinazzi also takes the Alfa out for the first time, so it's just the Ferrari of Leclerc that we're yet to see.
Hamilton comes in for a quick stop after that first 'lap', but heads straight back out on the C3 tyre.
Albon is also back on track for Toro Rosso, as Giovinazzi drives through the pits and Gasly brings the Red Bull back to the garage.
C4s are Toro Rosso's early weapon of choice, as Albon heads over the start/finish line to start a first timed lap.
Giovinazzi is back in this time round and is called straight into the Sauber garage, but Magnussen heads out again in the Haas.
Stopwatch
Albon goes comfortably quickest of all with a 1m26.529s, as the Toro Rosso kicks up a whole lot of sparks down the main straight.
Stopwatch
The Toro Rosso rookie is quicker again next time by, setting a 1m23.376s. But Magnussen looks as though he's going to go quicker.
Norris and Hulkenberg are also back out on track.
Stopwatch
Magnussen does go quickest of all on a 1m21.312s. Albon also improves, setting a new personal best of 1m22.985s.
Hulkenberg is just 0.004s slower than the Toro Rosso with his first effort.
Another marginal improvement for the Toro Rosso, which now has a fastest time of 1m22.792s.
A brief excursion for Hamilton during his early laps
Norris brings the McLaren back into the pits on the C5 tyre.
Stopwatch
Magnussen goes faster still at the head of the order - his new best is a 1m20.766s. He's setting these times on the unmarked tyre.
Stopwatch
But Hulkenberg deposes the Haas with a 1m20.646s on the harder C2 tyre. It's all go!
Gasly has gone out once more, and Russell is also on track for the first time since his initial installation lap.
For a second lap in a row, Albon heads back to the pits and drives straight through.
Russell has C4s fitted to the Williams, which is also sporting a couple of aero rakes.
It appears that Hamilton actually had an early spin down at the Turn 10 hairpin
Stopwatch
Magnussen couldn't quite improve on his previous lap, but is faster on the next. A 1m20.484s puts him back at the top of the pile.
Gasly visited the pits last time round, but has stayed out with those HUGE rakes on this lap.
By: Geoff Creighton
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