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Free Practice 1
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That's it then for the first practice session in India, with Vettel and Webber assuming the top two positions.
The Red Bulls are followed by Nico Rosberg and Romain Grosjean with Hamilton now in fifth.
Mark Webber makes it a familiar sight at the top of the timesheets: a Red Bull one-two.
Hamilton's on the rise, the Mercedes driver moving up to eighth after an effort of 1m27.774s.
Paul Di Resta, who missed this session due to illness and was replaced by and Force India reserve driver James Calado, will be back in the cockpit for FP2.
Alonso's session is over, say Ferrari. That gearbox problem won't fix itself and considering there are just 15 minutes left, the team know they won't get the car back out. The Spaniard managed just six laps.
What of Lewis Hamilton? Well, the Brit is down in 14th after a slight improvement.
Maldonado has a little spin at the chicane at Turns 6 and 7. He continues nevertheless.
Alonso's had a few problems out there this morning - the Ferrari man clearly has a gearbox issue and is now back safely in the garages.
Vettel's not standing for any dissention though, and the Red Bull driver lays down a new marker of 1m26.683s after Felipe Massa guided his Ferrari into third.
A flurry of fast times sees Vettel go top with a 1m27.196s before Rosberg hits back immediately, stopping the clock 0.021s quicker than the Red Bull star.
Rosberg looks quick here... and indeed he is as he lowers his benchmark time to 1m27.217s.
Rosberg now goes top of the shop, bumping Hamilton down to sixth after the Brit had gone fifth quickest.
Jenson Button goes to the top of the timesheets with a lap of 1m27.995s as more
Thirty-five minutes gone and Ricciardo finally makes it a full house as he emerges onto the track for the first time today. It appears his delay was due to a gearbox change.
Perez is the only man interested at the moment and he lowers his early benchmark to 1m28.207s in the face of no other times at all.
And Perez is duly the first man to clock a time today - it's a 1m30.953s for the Mexican.
The roar of Sergio Perez's McLaren finally shatters the silence.
Absolutely nothing going on out on the track at the moment as teams wait on sending their cars back out.
Mercedes: "Engine covers off both cars as per usual procedure and post-install checks underway."
And once Mark Webber is spotted out there, all but the Australian's compatriot Daniel Ricciardo in his Toro Rosso have been out for a sighter.
Big guns Kimi Raikkonen, Fernando Alonso, Lewis Hamilton and Nico Rosberg have all taken their machines out for a look at the circuit now.
Six minutes into the session and Indian F1 fans gets their first glimpse of champion-to-be (I think it's okay to say that) Sebastian Vettel in his Red Bull on the track.
Valtteri Bottas is the first man onto the track in his Williams and the Finn is quickly joined by team-mate Pastor Maldonado for installation laps.
Here we go then! We are green and the weekend has begun!
Time for a quick weather report: it's dry and fine at the track, about 40km south of New Delhi. Temperatures are forecast to reach 30 degrees on this first day of practice.
There could be double celebrations in the Red Bull garage this weekend with the team on the verge of collecting the constructors' championship trophy.
Sebastian Vettel can win his fourth world title here this weekend. All the Red Bull driver has to do is finish fifth on Sunday, regardless of where nearest rival Fernando Alonso ends up.
Hello and welcome to our live coverage of the Indian Grand Prix weekend, starting with the first of two practice sessions today.