Postpublished at Lap 44/57
"Power dropping in and out," says Lewis Hamilton. He's not been happy from the start of this race. Victory is slipping away from him. He's nine seconds behind Sebastian Vettel.
Summary
Vettel wins after leapfrogging Hamilton in pits
Hamilton second, Bottas third
Grosjean, Palmer, Ericsson out
Ricciardo, Stroll, Alonso also retired
Postpublished at Lap 44/57
Postpublished at 07:12 British Summer Time 26 March 2017
Mark Gallagher
BBC Radio 5 live Formula 1 analystFelipe Massa is putting in a very solid performance for Williams. He is more than a minute behind race leader Sebastian Vettel, that equates to 1.5 seconds slower per lap.
Postpublished at Lap 43/57
Lance Stroll pits and his Williams is wheeled into the garage. Race over.
Carlos Sainz, in eighth, lets his faster Toro Rosso team-mate Daniil Kvyat through.
Postpublished at Lap 42/57
Max Verstappen is the fastest man on the track as he does a 1:27.045.
Meanwhile, Lance Stroll has just been into the gravel. He is currently running in last.
Meanwhile, at the Rosbergspublished at 07:09 British Summer Time 26 March 2017
Postpublished at 07:08 British Summer Time 26 March 2017
Mark Gallagher
BBC Radio 5 live Formula 1 analystFormula 1 is a data-driven sport today and that can be the Achilles heel of some teams who get lost it.
Mercedes could have done with a dollop of common sense and looked above the pitwall, counted on their fingers and worked out where Lewis Hamilton was going to re-emerge into the race.
Postpublished at Lap 41/57
A personal best for Max Verstappen in the middle sector as he chips away at Kimi Raikkonen's advantage. The Ferrari, currently fourth, is four seconds down the road from the Red Bull.
Image source, Getty ImagesGet involved #bbcf1published at 07:07 British Summer Time 26 March 2017
Ares M: I'm messaging my son at Albert Park from Worcester listening on Mother's Day, so we're still together.
Postpublished at Lap 40/57
Fernando Alonso is clinging on to that 10th place at the moment but Esteban Ocon is closing in behind him, 0.9 seconds separate the two.
Postpublished at Lap 39/57
Lewis Hamilton trails Sebastian Vettel by eight seconds but he'll be starting to look over his shoulder. Valtteri Bottas is within 2.6 seconds of him now...
Image source, Getty ImagesPostpublished at Lap 38/57
Potentially losing the race and potentially being overtaken by Valtteri Bottas. Lewis Hamilton, having started the weekend so strong, is not having it his own way so far.
Image source, Getty ImagesRicciardo's dramatic daypublished at 07:03 British Summer Time 26 March 2017
Daniel Ricciardo's race may be over well before the chequered flag, but it was nearly done before lights out.
Relive the Australian's dramatic reconnaissance lap flop and recovery from the pit-lane via the 5 live clip below.
Media caption, Daniel Ricciardo comes to a halt with gearbox issues on his installation lap.
Get involved #bbcf1published at 07:03 British Summer Time 26 March 2017
Reece Young:@MercedesAMGF1, external ruined Hamiltons race. About to add insult to injury and ask Hamilton to move over for Bottas?
Postpublished at Lap 37/57
One to watch - Valtteri Bottas is third and closing in on Lewis Hamilton. The Finn shaves off half a second on the latest lap and is within three seconds of his team-mate. Will Mercedes allow the two to battle?
No Plan B just yet...published at Lap 36/57
"Tyres look like they are holding up," Lewis Hamilton is told over the team radio.
"Sticking with Plan A."
Image source, APPostpublished at Lap 35/57
Daniil Kvyat pits, unbelievably for the first time in this race, after 35 laps on ultrasofts. He's onto supersofts and back out in ninth.
Ricciardo watches on...published at 06:59 British Summer Time 26 March 2017
Postpublished at 06:58 British Summer Time 26 March 2017
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End of twitter postPostpublished at Lap 34/57
"We're looking for his 27s," Lewis Hamilton is told by his race engineer.
His latest lap is a 1:27.548.
Worth noting that Antonio Giovinazzi is quietly going about his business. He is currently 14th on his grand prix debut.
Image source, APPostpublished at Lap 33/57
We're still waiting to see what Mercedes' Plan B is. I suspect it is to make a second stop, but Lewis Hamilton is staying out there. He's cut the gap between himself and Sebastian Vettel to 5.5 seconds.
Image source, AP