Fernando Alonso the last man out - but he's nearly two seconds down, in 8th. Time to start gift-wrapping the title for Vettel? The German is out for another flyer, but with nobody even close to him he aborts his final flying lap and comes into the pits.
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Webber out with one more go at his team-mate - he is half a second slower than his team-mate, but might just take Rosberg...
Rosberg qualifies second - over seven tenths slower than Vettel. Hamilton crosses the line third fastest. so far, at least.
Once again Rosberg and Hamilton are out one in front of the other, in that order. Once again, Hamilton slower than his team-mate in the opening sectors.
Webber is out on the medium tyre for a second stint, Vettel out on softs again. Amazing tactics: Webber clearly being put out on mediums so as to block anybody using that strategy from winning the race ahead of a Red Bull.
Nobody else has yet set a time - Raikkonen now on an out-lap, he'll be first of the rest.
Webber clocks a 1:25.215 - only just over a second slower than his team-mate, suggesting that he might actually have a chance at pole if he had a go on the softs.
Vettel out as well - he's half a second up going into the final sector... and it's a 1:24.119! That's almost half a second quicker than he was in Q2, and surely nobody will touch that time. Outstanding.
Webber's first lap goes very wrong - he aborts and won't set a meaningful time.
Alonso comes over the line in 1:25.8, some 1.3 seconds slower than Vettel was in Q2 - and a second slower than his own Q2 time.
Alonso will cross the line first after getting ahead of Webber on the out-lap...
We've had a Red Bull lockout on the front of the grid the last two years of this race - that won't happen this year, unless Webber decides on a second run on soft tyres.
Alonso comes out right behind Webber - and both drivers are on the harder, medium tyre. They'll be a second or so slower than the field, but if they really nail one they might risk a lower place on the grid in order to start on the hard-wearing rubber.
Most of the drivers are sat in their cars waiting for Q3 to get under way: Webber the first man at the lights as the clock goes green.
On the evidence of the weekend so far, Vettel is set to take pole position by a big, big chunk - he's a country mile ahead of the rest on this track. But Alonso is looking sharp as well - he seems to have every chance of qualifying well and grabbing that second place he needs to force Vettel to wait for the title.
Ricciardo, Di Resta, Sutil, Vergne, Bottas and Gutierrez all drop out at Q2 - strange session so far, with drivers treating the softs as old-fashioned qualifying tyres.
Massa puts in another fast lap, leaving Hamilton in 10th - but the Brit is out again, and clocks in just in time with a 1:25.259 to make it into Q1.
Di Resta is the best of the chasing pack for that 10th spot - until Ricciardo leaps up to 8th. Hulkenberg now leaps up too, and Massa is now in 10th and in jeopardy.
Great lap by Alonso too - he's still a third of a second slower than Vettel, but is second.
Oh my god - Vettel and that Red Bull is just a ridiculous combination. He casually posts a lap half a second quicker than his team-mate, and will head back into the pits.
Webber fights back with the fastest middle sector of the day, and he then nails the final sector too - great recovery from the Aussie, and he posts a 1.25.097!
Webber on his flying lap now - but it's a poor opening sector and he might actually struggle here.
Webber comes out onto the track at last, and Vettel follows suit 30 seconds later. Both men will be able to squeeze a couple of flying laps out if need be.
Rosberg, Hamilton, Alonso and Massa are all over half a second clear of the rest of the field so far - all four look safe already, but of course you never know. Vettel and Webber yet to get out there.
Lewis Hamilton crosses the line within seconds of Rosberg, but is two tenths slower than his team-mate. Still good enough for second ahead of Alonso.
Nico Rosberg has sliced a quarter of a second out of Alonso going into the final sector... and he posts a 1:25.3 to go fastest.
Massa is on a flyer as well now, and goes second fastest, within seven hundredths of his team mate.
Alonso crosses the line in 1:25.544 - he'll need to do no more in this session, that will likely be more than enough to make the top 10.
Raikkonen loses a bit of time at the end - just a 1.26.2, he'll need better than that to guarantee passage.
Kimi Raikkonen also out right now - and he's on a flyer...
The reasoning behind trying to get through Q1 on mediums was sound: cars starting the race on softs will be forced to pit inside six laps during Sunday's race.
Fernando Alonso among the first out onto the circuit - soft tyres all round for everybody at this point.
Q2 gets under way - will we see any other big surprises to match what happened to Grosjean?
Grosjean's gamble on the mediums has worked well - but he overdid it on three or four corners each time, and lost enough time to miss out. If you gamble on a slow tyre in Q1, you have to put in near-flawless laps, which he just didn't do.
Grosjean gambled on getting through Q1 with the harder tyre, but it's a massive miss this weekend: driver after driver kept coming past him, and he misses out on Q2 for the first time since the Canadian Grand Prix.
He can! Massa goes fourth quickest, while Romain Grosjean - hero of qualifying so many times this season - is out!
Felipe Massa and Romain Grosjean are 16th and 17th! Massa only man left... can he do it?
Jean-Eric Vergne, 18th at the moment, off to a flyer on his final lap - he loses a bit at the end but comes in 11th to make it to Q2.
Busy track right now - Rosberg now goes second, Vettel and Alonso are back in the pits and smugly safe into Q2 after abbreviated efforts in this first session.
Paul Di Resta in the Force India delights the sparse fans by going top of the times - but he's quickly overhauled by Kimi Raikkonen with a 1:25.819.
Pastor Maldonado the biggest name outside the top 16 as things stand...
Vettel comes round - he's on the medium tyres... but is just 0.009 slwoer than Alonso! Those soft tyres on the Ferrari are worth a second a lap. The outrageous margin enjoyed by Vettel over anyone in the field is demonstrated in fine fashion there.
Alonso goes quickest on that softer tyre, but not bu much - just two tenths ahead of Gutierrez.
Alonso will be first of the big three left to put in a lap... he's shaved off a few tenths from Gutierrez...
Gutierrez puts in a 1:26 dead to go to the top of the timesheets right now.
Alonso is out on the softer tyre - normally you'd expect that set to be used in the race, but it seems not. They only last eight laps or so here in India, seems like they're thinking of starting out on mediums instead.
Vettel and Alonso both get into their cars now.
Rosberg still quickest, Hamilton improves to fourth.
Lewis Hamilton in the top 10 - Vettel, Webber and Alonso the only three drivers leaving it late, trying to conserve a set of tyres by only making one run from the looks of things.
Raikkonen looks like going quickest until he misses his line on the penultimate corner to lose nearly half a second. Lots of time to be lost on these quick corners.
Rosberg clocks a 1:26.6, but big names now flooding onto the circuit - Hamilton, Massa, Raikkonen all out on the circuit.
Rosberg having anoter flyer now, and has shaved three tenths off the fastest time so far in his opening sector - his team-mate Lewis Hamilton now out on the track too.
Nico Rosberg is out on a flying lap but makes a total mess of it and coasts round in 1:45.
Esteban Gutierrez clocks a 1:27.5 in his opening lap - just over two seconds slower than Vettel in FP3.
Webber, Hamilton and Alonso all yet to get into their cars - lovely dry afternoon conditions at the moment.
Vettel is still mooching around the garage - Gutierrez looks like being the first man out today.
Q1 gets under way at the hazy Buddh International Circuit! That smog got so thick earlier that the medical helicopter was grounded, forcing a truncated FP3.
Vettel is also the winner of this race for the last two years - we're moments away from Q1 now...
Sebastian Vettel comes into the weekend knowing that a win would give him the title, so long as Fernando Alonso doesn't finish second - and he's topped all three practice sessions so far this weekend.
Good morning and welcome to our LIVE coverage of qualifying for the Indian Grand Prix.