Postpublished at 16:07 British Summer Time 17 April 2015
Andrew Benson
Chief F1 writer
Doesn't get much closer than that. 0.001secs between Massa and Bottas on their first laps in P2.
Summary
Rosberg fastest in second practice, Hamilton 2nd, Raikkonen 3rd
Hamilton, Raikkonen, Vettel & Perez under investigation
Vettel collides with Perez after brake failure
Button breaks down for second time on Friday
Hamilton and Maldonado go off track
Raikkonen fastest in first practice
Postpublished at 16:07 British Summer Time 17 April 2015
Button update - work still ongoingpublished at 16:05 British Summer Time 17 April 2015
Honda Racing F1 on Twitter: In the garage the McLaren-Honda engineers are working on Jenson Button's car ahead of FP2.
Image source, Honda Racing F1Button's car lost power less than two laps into FP1, pitching the Briton into a spin.
Sparks flyingpublished at 16:04 British Summer Time 17 April 2015
Ooooh, Felipe Massa's Williams has just thrown up some lovely sparks from its titanium skidblock as he charged down the pit straight.
This session under lights should be very easy on the eye.
Green lightpublished at 16:00 British Summer Time 17 April 2015
The lights are on at the Bahrain International Circuit, the temperature is dropping, and we're off and running in FP2.
Time to show your hand, Mercedes.
Massa's missed opportunitypublished at 15:56 British Summer Time 17 April 2015
Over on F1 Rewind, Lewis Hamilton has just won the 2008 title in dramatic last-gasp fashion.
Still can't help but feel for this guy. He drove quite brilliantly all year.
Image source, Getty ImagesPostpublished at 15:53 British Summer Time 17 April 2015
Sauber on Twitter: Lights on! We are about to start
Image source, SauberRoaming in the gloamingpublished at 15:46 British Summer Time 17 April 2015
Just in case you're wondering how much of Sunday's race will be run in the dark, the answer is pretty much all of it.
The race is due off at 18:00 local time (16:00 BST) - just three minutes before sunset.
Image source, Getty ImagesNo cause for alarm at Mercedespublished at 15:40 British Summer Time 17 April 2015
Andrew Benson
Chief F1 writer
Image source, Getty Images"Mercedes drivers Nico Rosberg and Lewis Hamilton were only 15th and 16th in first practice but there was nothing to be alarmed about.
"The team decided that, because the daytime temperatures were so unrepresentative of what will be experienced in post-dusk qualifying and race, they would treat it as a test session.
"Much of their work was devoted to parts for future races. This second session should see a true reflection of Mercedes' competitiveness."
Get involved - #f1rivalriespublished at 15:37 British Summer Time 17 April 2015
Image source, Getty ImagesHere's two famous F1 rivalries rolled into one picture.
When this picture was taken in 1986, Ayrton Senna and Alain Prost on the left were still merely future McLaren team-mates, their intense rivalry - which has since become woven into the very fabric of the sport - still to take root.
Seated on the right, however, were two men already in a full-blown conflict.
Nigel Mansell and Nelson Piquet really did have a hate-hate relationship at Williams. Their bickering would allow Prost to nick in and steal the title from under their noses come the '86 season finale in Adelaide.
Piquet would take the title in '87 but only after a titanic struggle with Mansell that finally did for their already fractured relationship.
I don't want to lose your company...published at 15:32 British Summer Time 17 April 2015
...but if you love your F1 nostalgia you really need to check out our F1 Rewind programme, which today looks at famous title deciders.
It's on BBC Two right now or you can navigate to it using the tabs above.
Suzi Perry and Murray Walker have already taken a look back at the 1976 title decider and are now casting an eye over 1986. They conclude with 2008.
A mid-1980s-spec Steve Rider urges you to tune in...
Welcome backpublished at 15:27 British Summer Time 17 April 2015
Bye for nowpublished at 13:46 British Summer Time 17 April 2015
It's time for us to sign off for a couple of hours at the end of a session that leaves us no nearer to knowing what the order will be this weekend.
That said, it's hard to see beyond a Mercedes one-two come qualifying tomorrow, even with their sandbagging in FP1. Expect to see an awful lot more from the Silver Arrows later this afternoon. The question is, will Ferrari be able respond?
McLaren also continue to intrigue. The car's pace in the hands of Fernando Alonso looked reasonable in that session, but a problem for Jenson Button after just two laps has created yet more headaches for the team.
What will happen in FP2? Join us from 15:30 BST to find out.
In the meantime, be sure to watch F1 Rewind on BBC Two at 15:00 BST, where the subject will be famous title deciders of the past.
FP1 - full classificationpublished at 13:37 British Summer Time 17 April 2015
Image source, Formula1.comFP1 - Top 10published at 13:35 British Summer Time 17 April 2015
Ferrari one-two, Mercedes... 15-16published at 13:34 British Summer Time 17 April 2015
Ok, that practice session didn't quite play out as other have done this season, with the two Ferraris at the head of the pack.
The Mercedes are playing the long game, clearly working on set-up work, and their two drivers are way, way down the order.
Given Sunday is a night race, they will almost certainly show their hand in FP2, when it will be cooler.
Chequered flagpublished at 13:30 British Summer Time 17 April 2015
Ferraris atop the pilepublished at 13:24 British Summer Time 17 April 2015
Image source, Getty ImagesSome semblance of order has been restored to the top of the timesheets with Ferrari now sitting one and two, Raikkonen leading the way with a time two tenths up on team-mate Sebastian Vettel.
Palmer again keeps Maldonado honestpublished at 13:23 British Summer Time 17 April 2015
Jolyon Palmer has impressed again today. Although he's down in 14th at present, he is again just half a second down on regular Lotus driver Pastor Maldonado.
He's also completed more laps than any other driver in this session.
Here's your top five with just under 15 minutes leftpublished at 13:17 British Summer Time 17 April 2015
1. Valtteri Bottas (Williams) - 1:38.390
2. Daniel Ricciardo (Red Bull) - 1:38.455
3. Max Verstappen (Toro Rosso) - 1:38.504
4. Fernando Alonso (McLaren) - 1:38.598
5. Daniil Kvyat (Red Bull) - 1:38.661
The Mercedes of Lewis Hamilton and Nico Rosberg are 13th and 14th at the moment.
Get involved - #bbcf1published at 13:15 British Summer Time 17 April 2015
Frank Hardee: "I'm Jolyon Palmer's former A level politics teacher - so rooting for him on the last day of my Easter break in a Thailand bar!