Summary
Vettel on pole by half a second, Ricciardo 2nd
Hamilton only 5th a second behind
Raikkonen 3rd, Kvyat 4th, Rosberg 6th
Sainz hits wall, McLarens out in Q2
Vettel top in Q2, Kvyat top in Q1
Maldonado, Saubers, Manors out in Q1
Live Reporting
Gary Rose
Postpublished at 11:41 British Summer Time 19 September 2015
Postpublished at 11:40
11:40It is getting busy in the pits with drivers heading in as approach the time for a switch to the faster supersoft tyres.
Postpublished at 11:39 British Summer Time 19 September 2015
11:39 BST 19 September 2015Jenson Button has been out on the circuit after some issues early in the session and he has the 17th fastest time with Fernando Alonso in P16.
Postpublished at 11:34
11:34The Red Bulls now split the Ferraris with Daniil Kvyat improving to go second fastest, behind Sebastian Vettel, with 1:47.249. Daniel Ricciardo is P3, three tenths of a second slower than his team-mate.
Nico Rosberg is P5, with Lewis Hamilton P6 as we head into the final 25 minutes of this session.
Postpublished at 11:29 British Summer Time 19 September 2015
11:29 BST 19 September 2015Yellow flagpublished at 11:28 British Summer Time 19 September 2015
11:28 BST 19 September 2015Daniil Kvyat is bumped off top spot as Sebastian Vettel goes fastest of all with 1:46.728, with his team-mate Kimi Raikkonen 0.8s slower in second.
A brief flutter of the yellow flags as both Daniel Ricciardo and Lewis Hamilton go off at Turn 7 - a troublesome area for a few of the drivers today.
Postpublished at 11:27 British Summer Time 19 September 2015
11:27 BST 19 September 2015This Twitter post cannot be displayed in your browser. Please enable Javascript or try a different browser.View original content on TwitterThe BBC is not responsible for the content of external sites.Skip twitter postThe BBC is not responsible for the content of external sites.Allow Twitter content?
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End of twitter postPostpublished at 11:26 British Summer Time 19 September 2015
11:26 BST 19 September 2015Jennie Gow
BBC Radio 5 live pit-lane reporterQuote MessageThere is a big magnetic field near the tube station and that is why sometimes they have this glitch in the matrix, so to speak."
Singapore's Twilight zonepublished at 11:25 British Summer Time 19 September 2015
11:25 BST 19 September 2015Tom Clarkson
BBC F1 pit-lane reporterQuote MessageHere there can be an electrical interference near the Anderson Bridge. If a driver is making a gear change at that moment it can break the gearbox. The teams have to put in a few countermeasures when they come here."
Postpublished at 11:22
11:22Lewis Hamilton's first flying lap is a 1:47.969, putting him second fastest. Everyone - bar the Manor duo - are still on the softy tyre - the harder of the two compounds in Singapore.
Postpublished at 11:21
11:21Daniil Kvyat continues to lead the way on the timesheet, with Nico Rosberg popping up in third with his first effort of the session - a 1:48.393, seventh tenths of a second down on Kvyat's time.
Postpublished at 11:20 British Summer Time 19 September 2015
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End of twitter postPostpublished at 11:19 British Summer Time 19 September 2015
11:19 BST 19 September 2015Jennie Gow
BBC Radio 5 live pit-lane reporterQuote Message"Jenson Button is not even in the car. The car is up on the stands and it looks like McLaren have a problem - a telemetry problem but it looks to me like there is a lot of working going on. Hopefully they will get Button out before the end of the session."
Postpublished at 11:17 British Summer Time 19 September 2015
11:17 BST 19 September 2015Mercedes are one of those preparing to head out as we see shots of Niki Lauda watching a video of himself on his phone. As you do...
Postpublished at 11:17
11:17Ten times are on the board with 15 minutes of the session gone, but there is movement in some of the other garages and we should see some more cars out on track soon.
Postpublished at 11:14 British Summer Time 19 September 2015
11:14 BST 19 September 2015Eddie Jordan
BBC F1 chief analyst on Inside F1 last nightQuote Message"The drivers adore Singapore because there are a lot of good speed corners and reasonable straights. It seems much more of an equal test for everybody."
Get involved #bbcf1published at 11:13 British Summer Time 19 September 2015
11:13 BST 19 September 2015Your views on VW Red Bull takeover
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End of twitter postPostpublished at 11:11
11:11A few more times on the board as Daniil Kvyat, pacesetter in second practice, puts down a competitive time with a 1:47.968, putting him ahead of Toro Rosso drivers Max Verstappen and Carlos Sainz, who had a little lock up at the same place his team-mate spun a little earlier.
Postpublished at 11:09 British Summer Time 19 September 2015
11:09 BST 19 September 2015Tom Clarkson
BBC F1 pit-lane reporterQuote MessageOne of the reasons they are not going out yet is that the track conditions will change hugely as the sun goes down so I think they are letting others do the donkey work for them.
Yellow flagpublished at 11:09
11:09A spin for Max Verstappen as he loses it in the Toro Rosso at Turn 7. He doesn't hit anything though and recovers without any bother.
Meanwhile, no sign of either Lewis Hamilton or Nico Rosberg heading out of the Mercedes garage any time soon.