Barcelona F1 test day one
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Again, Hartley finds another snippet of time, improving to a 1m23.437s, but he stays sixth. Stroll now ahead of Mazepin, taking eighth place off the Russian.
Now Raikkonen moves back ahead of Hartley with a 1m23.351s. Hartley improves to a 1m23.633s, but remains sixth.
Raikkonen jumps to fifth on a 1m24.053s, although he's demoted moments later by an improving Hartley, who sets a 1m23.667s.
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Hartley gains another tenth there with a 1m24.096s, staying fifth. Stroll is down to a 1m28.061s now, he's still ninth.
As Renault has just pointed out its 2018 livery is inspired by its 1983 colours, we're rewarding it for going fastest with this picture of Alain Prost at Kyalami 35 years ago (LAT Images)
Raikkonen now gains a place to go seventh-fastest on a 1m25.798s. The Ferrari man is still on mediums.
Hartley gains a place now with a 1m24.164s, putting him up to fifth ahead of Alonso. He's on softs. Raikkonen and Stroll have also just improved, but remain eighth and ninth.
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Hulkenberg goes faster again, putting some daylight between himself and the field with that latest effort of 1m21.326s. That's 0.517s quicker than Bottas.
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Hartley and Stroll have also both improved, remaining sixth and ninth respectively.
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Hulkenberg takes over at the top of the timesheets with a 1m21.785s - 0.058s faster than Bottas. He's still using mediums.
Stroll also back on track, improving to a 1m32.692s, which keeps him ninth.
One of two definitive 2018 liveries unveiled this morning, here's another look at Red Bull's not-that-different colour scheme (Sutton Images)
Hulkenberg has just improved again, joining Bottas in the sub-1m22s club on a 1m21.903s. That's only 0.060s slower than the Mercedes driver.
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If you're just joining us, here's a recap of the first two hours:
- Bottas fastest for Mercedes, and leading the way on lapcount- Hulkenberg the nearest challenger, in terms of speed and miles- Early drama for Alonso has new McLaren loses a wheel and causes a red flag- Quiet morning for Ferrari, with Raikkonen yet to set a representative time
- Bottas fastest for Mercedes, and leading the way on lapcount- Hulkenberg the nearest challenger, in terms of speed and miles- Early drama for Alonso has new McLaren loses a wheel and causes a red flag- Quiet morning for Ferrari, with Raikkonen yet to set a representative time
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That's an encouraging start for Renault, which is going into a very big year for itself and its customers, as JONATHAN NOBLE explained this weekend after getting the inside line on the firm's winter: 
Hulkenberg improves to a 1m22.280s, putting himself within four tenths of Bottas.
Mazepin moves up to seventh place ahead of Raikkonen as he breaks the 90-second barrier for the first time today.
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Hulkenberg improves to a 1m22.791s, cutting the gap between himself and pacesetter Bottas to under a second. Mazepin continues to make progress, setting a 1m30.517s that time round.
Mazepin improves again to a 1m32.967s, staying eighth.
Mazepin up to eighth ahead of Stroll, meanwhile, with a 1m34.644s.
Another place gained by Grosjean, who jumps Ricciardo with a 1m23.092s.
Grosjean moves up a place to fourth now with a 1m23.861s. Mazepin has finally set Force India's first timed lap too, the Russian teenager posting a 1m39.186s.
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First sub-1m22s lap of the day comes from Bottas, it's a 1m21.843s.
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New best time of the day from Bottas, who lowers the bar to a 1m22.366s. He's still on mediums.
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It may be a Force India that's Mazepin's out in right now, but what will it be called next month? The much-anticipated team name change is imminent: 
Mazepin out in the Force India, just he and Ericsson yet to set times so far this morning.
Stroll knocks another two seconds off his best effort with a 1m35.112s, but he remains eighth. Grosjean stays fifth with his personal best of 1m24.534s.
Grosjean meanwhile moves up a place at Hartley's expense, a 1m25.561s putting him fifth.
Stroll makes a very modest improvement next time round, as he sets a 1m37.260s on softs.
Now Stroll has opened his account with a 1m37.351s, only enough for eighth place for now.
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Grosjean gets himself on the board now with a 1m28.415s, putting the Haas man sixth-fastest.
Hulkenberg goes second-fastest moments later with a 1m22.823s. The Renault is also on mediums.
Stopwatch
New fastest time of the day from Bottas, a 1m22.435s.
Gary Anderson
Looking again at the McLaren lost wheel, Alonso was on what I think was his fourth lap. I’m surprised a loose wheel would stay on that long rattling around so the driver can feel it.
The big drama for McLaren is not going to be the wheel coming off itself, but the damage done by dragging the floor of the car through the gravel at a time when spares will be limited.
If the wheel did just come off, then it will be a torque setting on a wheelgun not being correct – something has likely gone wrong of that nature.
The big drama for McLaren is not going to be the wheel coming off itself, but the damage done by dragging the floor of the car through the gravel at a time when spares will be limited.
If the wheel did just come off, then it will be a torque setting on a wheelgun not being correct – something has likely gone wrong of that nature.
By: Geoff Creighton
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