Ricciardo fastest in second practice, Hamilton 5th, Vettel only 11th
Red Bull appear to have best race pace as Mercedes & Ferrari struggle
Verstappen crashes in first session - adding to several incidents this season
Final practice & qualifying coverage from 10:30 BST Saturday
What is your favourite race of all time and why?
Daniel: Belgium 2000, simply for THAT pass from Mika on Schumi, diving down the inside as Michael went round the outside of Zonta
Image source, Getty ImagesWhat of Sebastian Vettel? I have little to tell you so far. Nothing representative. He is the slowest out there, but that means nothing.
Elsewhere, McLaren's Fernando Alonso is seventh and team-mate Stoffel Vandoorne is 17th.
Sauber's Charles Leclerc continues his impressive start to his Formula 1 career and is 12th, with team-mate Marcus Ericsson only 16th and there are signs of encouragement for Williams with Sergey Sirotkin eighth and Lance Stroll ninth.
Will Ricciardo be Hamilton's team-mate next season? Well, Valtteri Bottas may have something to say about that.
The Finn produces a stunning lap on the ultrasofts. Almost a second faster than Ricciardo.
Image source, ReutersProblems for Carlos Sainz. He locks up and his car is not sounding too healthy. Down in 18th so far.
It was not long before Daniel Ricciardo regains the top spot, 1:45.150 to raise the Ricciardo stock even further.
Only five hundredths of a second faster than Lewis Hamilton. Will the pair be team-mates next season?
On the ultrasoft tyres, Lewis Hamilton jumps to the top with a 1:45.200, 0.169 faster than Daniel Ricciardo's best effort so far today.
Sergio Perez and Esteban Ocon in the Force Indias are fourth and fifth.
Image source, Getty ImagesMax Verstappen hits the wall
Ray Davies: Mad Max is becoming a liability not only ruining his campaign but those of the other lead drivers. I think Charlie needs to have a word with him. Stop and think about what you are doing or I will force you to sit out a race to do so!
Countdown Music Aust: It takes Crash Verstappen only 11 laps to put his car into the wall. He has to reflect and think about his driving.
Andy K: Verstappen trying to rival Maldonardo for most crashes in a season.
You lot are not too impressed with Verstappen. He has a bit of a way to go to rival Maldonado, as you can see with this graphic...
Image source, .Greatest F1 race - #bbcf1
Adam Johnson: My favourite race was Silverstone 2008, Went to it was at Luffield on a very rainy day and saw about three cars spin in front of me. Button did 360 and kept going. Only disappointment was Hamilton won.
John Neathey: The greatest race for me was Spa '98. I'd supported Jordan from the start and this was the one time I almost cried at a result. Just seeing the two Buzzin Hornets tiptoeing through the carnage was enough to send me into raptures! What a day.
Image source, Getty ImagesLewis Hamilton misses a corner at turn two but luckily avoids all the walls. He reverses back on to the track, no harm done.
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We have not seen much of Ferrari so far today, and finally they are up and running with Kimi Raikkonen up to fifth. Nothing of note yet from the world championship leader Sebastian Vettel.
BBC Radio 5 live
The BBC Radio 5 live team will be discussing the Red Bull pair on tonight’s Azerbaijan Grand Prix preview show on 5 live at around 21:00 BST.
Red Bull have two drivers in their garage. One is widely tipped as a future world champion; the other's immediate future remains up in the air.
One is regarded as one of the most exciting attacking drivers on the grid; the other's style seems to slip under the radar.
Max Verstappen often seems to steal the headlines at Red Bull but did Daniel Ricciardo's win in Shanghai prove he is the team's star man?
Read our feature here and see who is the better driver.
Image source, .We are back under way as Max Verstappen's Red Bull heads back to the garage to give his team some work to do.
We have no action at the moment as the stewards recover Max Verstappen's Red Bull. These are the top 10...
Another bad start to the weekend for Max...
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Jolyon Palmer
Former Renault driver on BBC Radio 5 live sports extra
Maybe Max has got to think about calming down for a few weekends and compromise and not go 100%, just 98%, and make sure he gets some points and builds his confidence up.
He has done 11 laps and found the wall again, it is going to be playing on his mind.
Image source, ReutersMax Verstappen hits the wall
Kayleigh: Last year Grosjean was crashing in practice, this year is Verstappen...
RantingMrP: Mad Max strikes again...into the wall...
Racing Insider: Like father like son? Jos Verstappen had lots of car control and natural talent but was prone to crashing... Is @Max33Verstappen, external proving increasingly to be from the same mould?
Image source, Formula 1 TwitterGreatest F1 race - #bbcf1
Liz Emery: Favorite GP of all time was the French Grand Prix in 2000. David Coulthard was on fire that day and pulled off some great moves! And who can forget his cheeky hand signals to Michael Schumacher as they fought for the lead!
Ged Ashton: My favourite moment is the Canadian Grand Prix 2011 where Button won a thriller with six pit stops.
Image source, Getty ImagesJolyon Palmer
Former Renault driver on BBC Radio 5 live
I have not seen that at Baku before. It was a big hit, it was a tight lefthander but he had a big slide, over-corrected and ended up pointing the wrong way in the wall.
An absolute disaster for Verstappen. I would be amazed if there was not significant damage.