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Jerez first pre-season test Test day one
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39 min
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And that's it - the flag is out on day one at Jerez. Join us for more from 08.00 GMT tomorrow.
A late improvement in the first sector for Grosjean but the overall lap isn't quicker in the Lotus.
Grosjean, di Resta, Hulkenberg, Maldonado and van der Garde are the men on track with five minutes of the session remaining.
Button wraps up a short outing on the hard tyres with a 1m20.450s before returning to the McLaren garage.
The new best comes from Button's first lap of a run, with a follow-up of 1m19.696s next time by.
Button flashes past the pits in 1m18.861s to put his McLaren on top of the times.
There's some late movement from Button, di Resta and Hulkenberg as the clock ticks towards the final 10 minutes of the opening day in Jerez.
Webber's pace-setting Red Bull is now back on track.
Pace in the mid 1m22s range for Grosjean as he works around a ninth timed lap of the run.
Hulkenberg, meanwhile, is back on track for Sauber, with Grosjean the only other man out there now in his Lotus.
Back into the pits now for Button to wrap up eight timed laps, his pace ending up in the 1m21.4s bracket by the end of the outing.
Button continues round in mid-1m22s.
Webber completes that five-lap run. His average was in the 1m23s, but a very slow mid-outing lap skewed that statistic.
Button's times were more consistent. He has gone from a 1m20.081s to a 1m21.395s, losing almost exactly 0.3s with each lap.
After that timesheet-topping 1m19.7s, Webber dropped back into 1m21s, and now a 1m22s.
Both Button and Webber set their fast times on medium tyres.
Williams gives its fans some reassurance as Maldonado prepares to head out again: "The boys are running through the test programme but it takes time to do the changes.... that's what happens when you can run all day!"
Webber drops back to a 1m21.398s with his next lap, while Button is only a little off his previous best with a 1m20.375s.
Button shows McLaren's hand more too, jumping to third with a 1m20.081s.
That puts him just 0.087s ahead of Grosjean's Lotus, but it's a possibly ominous sign given that the champion team often plays it cool in early tests.
Webber goes quickest. The Red Bull delivers a 1m19.709s.
The track is getting relatively crowded now: di Resta, Massa, Webber, Button, Hulkenberg and van der Garde are all out.
Hulkenberg is next to improve as he does a 1m20.699s to advance to seventh place.
"We've identified an issue with the rear suspension which requires further inspection and so we won't take part in any more running for today," said the team.
"After such a positive start to our test it is disappointing, but this is what testing is for and, most importantly, Max is just fine."
"After such a positive start to our test it is disappointing, but this is what testing is for and, most importantly, Max is just fine."
News from Marussia: Max Chilton's earlier crash was caused by a suspension failure.
It was a 1m20.536s from the Ferrari, and it's followed by a 1m21.5s then a 1m21.8s.
Massa comes out and goes straight on the pace, improving to fourth with his first lap.
Di Resta is six laps into a quite consistent run. A string of high 1m24s started it, now he's into 1m25s.
Just two cars on track at the moment as the test day goes into its final stages: di Resta and Maldonado.
Edd Straw has been checking out suggestions that Chilton's crash was caused by a mechanical failure. He says the team is currently investigating.
Lots of burnouts from Mark Webber as he heads down the pitlane. He stops briefly before making a practice start.
Sauber says its afternoon programme is focused on "aero measurements" - as Nico Hulkenberg slows on the start/finish straight again
Worth noting that while McLaren experienced another fuel pump failure today, that part has been redesigned following its similar troubles towards the end of 2012.
Our AUTOSPORT team have all returned to the media centre, having spoken to the likes of Christian Horner, Martin Whitmarsh and Nico Rosberg in the last hour. More to come from them shortly.
Hulkenberg is next out. Sauber is vying with Force India and Williams for most laps run today.
The track is open again, and Felipe Massa is first to head out on a set of medium compound tyres. Pastor Maldonado follows, and does a practice start at the end of the pitlane.
Only the damaged part of the Marussia is covered as the team gets it off the back of the recovery truck.
The Marussia is almost back to the pits. Unlike when McLaren and Mercedes had problems earlier, the mechanics haven't covered the car before its return.

Jacques Villeneuve and Michael Schumacher, 1997 European GP
The corner where Chilton crashed is of course known better as Dry Sack - a hairpin made famous by Jacques Villeneuve and Michael Schumacher's clash in the 1997 title decider.
As the Marussia is taken away, we get a better look at the damage. The car has taken a hit on the right rear and damaged the suspension.
By: Sam Tremayne, Matt Beer, Glenn Freeman, Geoff Creighton
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