Jerez first 2015 test Test day one
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Ricciardo is another half a second slower next time by, while Rosberg comes back into the pits with 136 laps to his name.
The Red Bull gets out of shape in the middle of the final corner, and Ricciardo crosses the line two tenths down on his best - so half a second adrift of former team-mate Vettel's pacesetting time.
Ricciardo has gone fastest of all through the first sector, although he's dropped a couple of tenths in the second part of the lap.
Bottas pits, but for a few seconds there we had a 2015-high of five cars on track at the same time. Vettel, Rosberg, Ricciardo and Ericsson are out there at the moment.
It's still the Rosberg and Bottas show out on circuit. Rosberg's now managed 130 laps and his pace has gradually dropped away from the 1m25s to the low 1m26s. Bottas is doing consistent 1m26s laps.
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The McLaren-Honda has been stuck in the garage for a while now. The team says it is currently trying to trace a problem with the MP4-30.
"Tracking down a niggly problem - which is taking some time. Hope to be out again before the end of the day."
"Tracking down a niggly problem - which is taking some time. Hope to be out again before the end of the day."
Keke's son is now up to 122 laps completed in the Mercedes W06. He and Bottas continue to do similar laptimes - now in the low 1m26s.
Keke Rosberg
The fact the new Mercedes has racked up over 100 laps already today will have come as an unwelcome shock to the other teams present at Jerez.
But one observer who seems particularly surprised is Rosberg's father and 1982 F1 champion Keke Rosberg, as one paddock snapper managed to capture.
Vettel manages a 1m23.5s lap before diving back into the pits. No long runs yet from Ferrari, but encouraging pace from James Allison's first full car for the Scuderia.
Pacesetter Vettel is back out in the Ferrari SF15-T and straight into the 1m24s. He's sharing the circuit with Rosberg, Bottas and Ericsson.
Ricciardo is back in the pits now, having whacked in another 1m24s lap before he did so. Rosberg and Bottas are currently trading blows in the mid-1m24s.
Ricciardo has backed off over the last two laps of his running - dropping back to a 1m32.7s last time through. Rosberg is back out and lapping in the 1m24s. Bottas has also rejoined the action.
Ricciardo goes third fastest on the next lap. The Australian breaks into the 1m23s now and splits Rosberg's Mercedes and the Williams of Bottas.
Interesting to compare the McLaren-Honda performance so far with where everyone was on the equivalent day last year. Alonso has managed six laps, with a best time of 1m40.738s.
That's better than both Caterham and Red Bull managed (four laps between them, no time registered) and also Sauber (seven laps, with a best of 1m42.257s) but well off where others were. Bottas, in the Williams, for example did seven laps with a best of 1m30.082s.
Obviously, it's still very early days yet for Honda.
That's better than both Caterham and Red Bull managed (four laps between them, no time registered) and also Sauber (seven laps, with a best of 1m42.257s) but well off where others were. Bottas, in the Williams, for example did seven laps with a best of 1m30.082s.
Obviously, it's still very early days yet for Honda.
Ricciardo pressing on now in the RB10. A big wiggle as he comes out of the final corner before setting a new personal best time and then the fastest first sector of all so far...
Red Bull is back in action this afternoon after a long delay. Ricciardo's morning run came to a smoky end, and the team took power tools to the car around lunchtime.
Vettel back in after a short run. The Ferrari has racked up 23 laps now. Sainz and Bottas still rolling round. Both are lapping in the 1m25s at the moment.
Vettel and Sainz join Bottas out on track. Bottas is on a longer run and lapping in the 1m26s at the moment.
Bottas heads back out onto the circuit in the Williams, so the track wakes up again after a bit of a lull.
Mercedes
There are doubtless a lot of very knackered mechanics in the pitlane right now, as the build-up to launches and tests are the toughest time of the year for those creating the cars.
Our anonymous F1 insider the SECRET MECHANIC has been sharing tales of how the cars seen at launches might not be quite all they seem, and just how it feels when a driver shunts the car you've spent all winter finishing:
Secret Mechanic: All is not as it seems pre-season
JONATHAN NOBLE reports from the pitlane that Ron Dennis is in the McLaren garage surveying the MP4-30. It's not been out much, but things seem to be going more smoothly for Honda than they did in Abu Dhabi.
Vettel returns to the pits having lit up the timing screens on that run. All quiet on the track in Jerez for now.
Stopwatch
Vettel's next lap is a fraction faster again. The four-times world champion has lowered the benchmark to 1m22.958s.
Both Vettel and Rosberg have gone faster than last year's fastest time overall from the Jerez test. The fastest in 2014 was a 1m23.276s.
Vettel's pit board suggests he has three laps left on this run.
Stopwatch
Vettel leaps to the top of the times for Ferrari. First man into the 1m22s and a tenth quicker than Rosberg's best effort so far
A couple of updates from JONATHAN NOBLE down in the paddock:
"Ricciardo has just headed towards the Red Bull garage in his overalls, so he may be heading back out soon.
"There's still a big empty slot behind the pits where the Lotus trucks should be, so the E23 is not here yet."
"Ricciardo has just headed towards the Red Bull garage in his overalls, so he may be heading back out soon.
"There's still a big empty slot behind the pits where the Lotus trucks should be, so the E23 is not here yet."
Vettel 2015 Ferrari Jerez
Vettel heads back out in the Ferrari. With just 17 laps completed, Ferrari is lagging way behind Mercedes on mileage. Only Fernando Alonso's McLaren-Honda has completed fewer laps so far.
Rosberg is back in the pits, leaving Sainz the Jerez circuit to himself. The Spaniard is lapping in the 1m27s at present.
Rosberg completes his 100th lap of the day in the Mercedes, and it's not even 2pm yet... Sainz has decided to join in the fun in his Toro Rosso.
Bottas back into the pits after a longer run. He's racked up 19 laps now in the FW37. Only Rosberg left out there at the moment. He's almost made it to 100 laps...
Stopwatch
Vettel picks the pace up again, and his 1m24.000s means he joins Bottas in getting inside one second of the pace set by Rosberg.
Bottas has now settled into mid-1m25s, while Vettel is quickly falling away into the 1m26s after setting his best lap.
Rosberg continues to notch up the laps, currently running in the 1m26s as he completes his 94th of the day.
Rosberg continues to notch up the laps, currently running in the 1m26s as he completes his 94th of the day.
Stopwatch
Vettel sets a new personal best for the day, but it's not enough to move the Ferrari up from sixth in the standings.
He makes amends a lap later, going third with a 1m24.279s.
He makes amends a lap later, going third with a 1m24.279s.
Stopwatch
We have a car within one second of Rosberg's best: Bottas moves up to second in the Williams with a 1m23.906s. That puts him 0.8s adrift of the Mercedes.
Breaking news
Rosberg Mercedes 2015 Jerez
If you want a refresher of all the events at Jerez so far today, including results and halfway-point lap counts, here's our morning round-up:
Jerez test day one am: Rosberg sets commanding pace
Vettel re-appears after a long spell in the garage for the Ferrari. It didn't sound great heading out onto the track though.
Bottas joins Sainz and Rosberg on track, as Williams is about to head into double figures for day one in terms of laps.
Stopwatch
Another improvement for the 2014 Formula Renault 3.5 champion, and now Sainz is above Vettel in the standings with a 1m25.327s.
Stopwatch
Sainz improves by two tenths with a 1m25.836s, so he's just 0.072s adrift of Vettel's best in the Ferrari now.
By: AUTOSPORT staff, Edd Straw, Glenn Freeman, Ben Anderson, Andrew van Leeuwen, Jonathan Noble, Jamie Klein
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