As it stands after 10 lapspublished at 13:21 British Summer Time 10 May 2015
It was anticipated the front three would employ a two-stop strategy, but does plan B mean Lewis Hamilton will be on a three stopper?
Summary
Rosberg wins, Hamilton 2nd, Vettel 3rd, Bottas 4th
Hamilton recovers after being passed by Vettel at start
Grosjean hits pit crew during stop
Alonso, Maldonado out
As it stands after 10 lapspublished at 13:21 British Summer Time 10 May 2015
Postpublished at 13:21 British Summer Time 10 May 2015
Jennie Gow
BBC Radio 5 live pit-lane reporterMeanwhile, Maldonado is storming but he has a damaged right rear wing endplate - doesn't seem to be holding him up much, currently P7.
Postpublished at 13:19 British Summer Time 10 May 2015
David Coulthard
BBC F1 co-commentator"This is a positive showing from Maldonado and he really needs a strong weekend."
The Lotus driver is running in seventh place, ahead of team-mate Romain Grosjean.
Rosberg builds advantagepublished at 13:19 British Summer Time 10 May 2015
Pastor Maldonado, winner of the Spanish GP in 2012, is going for it. He is up to seventh now having picked off Max Verstappen and now he has Felipe Massa in his sights.
Up front, everything is pretty peachy for Nico Rosberg, who leads by more than six seconds. Comfortable, and a contrast to Lewis Hamilton's fortunes, who is informed over team radio that he is "switching to plan B."
Image source, APPostpublished at 13:19 British Summer Time 10 May 2015
Tom Clarkson
BBC F1 pit-lane reporter"We're getting towards three-stop territory now. If you are doing a three-stop, you need to stop around lap 10 or 11. It is theoretically quicker."
Get involved - #bbcf1published at 13:18 British Summer Time 10 May 2015
Rian Hoskins: Rosberg couldn't have had a better start but while Hamilton has work to do, he relishes the challenge of fighting his way through.
Justin Gray: C'mon Vettel we want an exciting season and you're the only one that can make that happen.
Di B: Think a bit of Hammertime might have to come now rather than later!
"Impossible to get close"published at 13:13 British Summer Time 10 May 2015
Replays show too much wheelspin from Lewis Hamilton hampered his start and he is struggling to close in on Sebastian Vettel. "It is impossible to get close," he reports over team radio. He is a second behind with the Ferrari with six laps gone.
Meanwhile, Romain Grosjean has to give up his position to Daniel Ricciardo and the Lotus is down to 11th.
Sainz under attackpublished at 13:09 British Summer Time 10 May 2015
Carlos Sainz is mixing it with some of the big guns after qualifying fifth and he is swiftly under attack. Not long after Kimi Raikkonen passes him, Felipe Massa also sweeps past with ease just before Turn One and the Spaniard is down to eighth.
Postpublished at 13:07 British Summer Time 10 May 2015
Ben Edwards
BBC F1 commentator"Hamilton not getting away as well as he planned. He's in third position and Rosberg is beginning to open up a gap on the Ferrari of Vettel."
Image source, ReutersRosberg leads after lap onepublished at 13:06 British Summer Time 10 May 2015
No real drama in the first lap as everyone manages to keep out of each other's way. Nico Rosberg leads Sebastian Vettel by one second, with Lewis Hamilton two seconds behind.
Kimi Raikkonen, who started from seventh, makes the biggest gain climbing up to fifth. Good start from the Finn after a pretty torrid weekend so far.
Image source, AFP/GETTYPostpublished at 13:04 British Summer Time 10 May 2015
Jennie Gow
BBC Radio 5 live pit-lane reporterThe lowest winning #F1 Spanish grid slot of the past 10 years was P5 (ALO,13) - currently occupied by another Spaniard… Sainz!
Go! Go! Go!published at 13:04 British Summer Time 10 May 2015
The lights go out and the 2015 Spanish Grand Prix is under way!
It is a long run down to the first corner, 730m to be exact, and Nico Rosberg is away perfectly, holding on to the lead as Lewis Hamilton drops down to third, behind Sebastian Vettel.
Image source, APPostpublished at 13:01 British Summer Time 10 May 2015
The formation lap is under way, with all of the grid heading out on the medium rubber.
Postpublished at 13:00 British Summer Time 10 May 2015
Image source, McLarenMcLaren: Tyre blankets disconnected, cables out of the way & the crew prepare to unwrap the tyres
Get involved - #bbcf1published at 12:57 British Summer Time 10 May 2015
Brett Heasman: Hamilton-Rosberg collision, Vettel victory with Bottas & Verstappen on podium.
Jeremiah Kariuki: Given the challenges of overtakes in the circuit, many drivers may opt to try and move up positions at the start. Recipe for safety car!
Phil Slocombe: Lewis to make another electric start and take Nico before the first corner. Another win with Nico or Seb second, Kimi 3rd.
Pirelli predicts...published at 12:56 British Summer Time 10 May 2015
"A three-stop strategy is theoretically slightly quicker for the 66-lap race, but doesn't justify the traffic risks involved. Consequently, a two-stopper is actually more likely: especially for the cars at the front of the grid.
"The best strategy would be start on medium, medium again on lap 23, hard on lap 50. The theoretically fastest three-stopper is to start on the medium, switch to medium again on laps 17 and 35, before a final stint on the hard from lap 55."
Postpublished at 12:53 British Summer Time 10 May 2015
Image source, Formula 1The anthems have been completed. All that remains is for the grid to clear, the drivers to get into the cars and then it is lights out!
Drivers' championship standingspublished at 12:51 British Summer Time 10 May 2015
How will the drivers' standings look in a couple of hours?
Postpublished at 12:50 British Summer Time 10 May 2015
McLaren on Twitter:, external It's hotting up on the grid. That updated lick of paint is looking mega in the sunshine.
Image source, McLarenPostpublished at 12:49 British Summer Time 10 May 2015
BBC Radio 5 liveYou can now listen to BBC Radio 5 live commentary on the race on your radio and online, via the live coverage tab on this page. Get it on!