Ricciardo finishes fastest
McLaren brings out first red flag of session
Alonso returned to track just before lunch
First pre-season test ahead of 2018 season
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1) Hartley 90
2) Ricciardo 84
3) Raikkonen 77
4) Hulkenberg 73
5) Ericsson 60
6) Bottas 58
7) Grosjean 54
8) Stroll 46
9) Alonso 31
10) Hamilton 25
11) Mazepin 22
12) Sainz
13) Sirotkin
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Image source, McLarenThe clouds are looking increasingly gloomy as Sergey Sirotkin returns to the pits, leaving the track empty with two hours of the session remaining.
A 13th and final time has just appeared on the timing screen because Sergey Sirotkin has just done a 1:44.148 in the Williams.
That's the Russian's first time of the day, done on his 15th lap.
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Ninety laps for Toro Rosso so far today...
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And Lewis Hamilton heads back out. He's also made the move from medium tyres to softs.
Looks like there isn't enough concerns about the weather to completely stop running because Fernando Alonso is on his way back to the circuit.
Thank you, Fernando.
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Strong start by Michael...
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Everyone is back in the pits and that may well be because there are a few more drops of rain.
No changes at the top of the order but Lewis Hamiltonh is now up to sixth after 1:22.327. He's done 21 laps so far this afternoon. Steady away.
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To kick things off:
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Really enjoying your updates Greg! Providing a great eye on the ground.
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The rain is staying off for now after a few spots fell just before the start of the afternoon session.
Fernando Alonso has just done personal bests in sectors one and two but loses time in the final sector and doesn't improve on his 1:21.339.
He's also just completed his 30th lap, beating last year's total from day one.
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Here's another good view of what it's like to drive with the halo courtesy of Williams and Robert Kubica.
The onboard camera could probably do with a new position.
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Toro Rosso are really putting that Honda engine to the test. Brendon Hartley has done 89 trouble-free laps so far.
Carlos Sainz is out and is taking pretty easy with his laps. His latest time is a 1:32.550, eight seconds off the pace.
1) Ricciardo 1:20.179 - Medium
2) Bottas 1:20.349 - Medium
3) Raikkonen 1:20.506 - Soft
4) Hulkenberg 1:20.547 - Medium
5) Alonso 1:21.339 - Super-soft
6) Hartley 1:22.371 - Soft
7) Stroll - 1:22.452 - Soft
8) Grosjean 1:23.092 - Medium
9) Hamilton 1:23.932 - Medium
10) Ericsson 1:24.897 - Medium
11) Mazepin 1:25.628 - Medium
Nineteen laps so far for Fernando Alonso. Just 10 more needed to surpass the total he managed on the first day of the first test last year.
Lewis Hamilton gets up and running with a 1:26.974 on his fourth lap of the session.
Fernando Alonso, meanwhile, is up to fifth after doing a 1:21.339 He's on the super-softs.
Daniel Ricciardo, Brendon Hartley and Sergey Sirotkin are also on the track.
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Dave Corkin: McLaren must feel like they have been playing a one armed bandit for 3 years, feeding it coins each day, then they give up on it and a sneaky old lady sticks 10p in and wins the jackpot...