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
Remember to catch the Azerbaijan Grand Prix preview on BBC Radio 5 live on Friday at 21:00 BST.
Some other things worth looking at...
We will be back at 10:30 BST tomorrow for all the action from the third practice session. Thanks for joining us and for your comments, see you tomorrow.
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Andrew Benson
BBC Sport’s chief F1 writer
Image source, Getty ImagesRed Bull's Daniel Ricciardo edged Ferrari's Kimi Raikkonen in second practice at the Azerbaijan Grand Prix.
Ricciardo, superb winner of the last race in China, was just 0.069 seconds clear of Raikkonen as championship leader Sebastian Vettel struggled.
Vettel was 11th, 1.3secs off the pace, and struggling for grip as he suffered lock-ups and off-track moments.
Mercedes' Valtteri Bottas and Lewis Hamilton were fourth and fifth, behind the second Red Bull of Max Verstappen.
Bottas was 0.775secs off the pace as Mercedes, like Vettel, appeared to be suffering on the tricky Baku street track and its low-grip, low-abrasion surface.
Image source, Formula 1Max Verstappen crawled back to the pits, Red Bull will be hoping it is nothing serious. A strange end to the day for them.
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Race winner in China and the fastest in practice session two for Red Bull's Daniel Ricciardo.
A miserable day for Sebastian Vettel. He was 10th quickest in session one, and 11th fastest in session two.
Kimi Raikkonen was second quickest, with Max Verstappen third after smashing into a wall earlier in the day.
Valtteri Bottas (fourth) and Lewis Hamilton (fifth) were next in line.
Image source, Rex FeaturesYour thoughts on Verstappen and Ricciardo
Oli Jones: Max no worse than Hamilton in 2008 who drove into back of Alonso and then a stationary Raikkonen. Plus hit barrier in Monaco. And still world champion that year. Long way to go
Matthew Jackson: Verstappen the most naturally gifted, Ricciardo the more well-rounded. Max for a spectacular win in the wet, Dan for a championship!
Image source, Getty ImagesSession three of practice takes place at 11:00 BST on Saturday, with qualifying at 14:00 BST.
The top ten at the moment...
"Honestly, what is this Williams doing," asks a frustrated Stoffel Vandoorne as Sergey Sirotkin gets in his way.
Time for the pit crews to get some practice in.
This is Brendon Hartley's team making sure everything runs smoothly on Sunday.
Image source, Toro RossoHave you predicted your podium for Sunday's Azerbaijan Grand Prix?
Don't worry, there is still time to do so, so click here to play along.
Esteban Ocon sits top of the speed trap timings. No Verstappen or Hamilton in the top 10, although they are third and fifth fastest overall respectively.
Image source, Formula 1Who is the better driver - Verstappen or Ricciardo?
Joseph Tolman-Lopez: Verstappen won his first race at Red Bull. Youngest race winner. Future champion. But now he's making a meal of every opportunity he has! Ricciardo is a more reliable driver right now but probably won't go down in history the same way Max will
Daniel: Ricciardo is the better team driver, maximises the car on the bad days and capitalises when circumstances favour him. Verstappen needs to learn to look beyond that moment without losing the instincts that make him dynamic.
Image source, Getty ImagesThese are the times so far with 25 minutes left. Not many bothering with the yellow soft tyres in this second session.
Image source, Formula 1A rather worrying message from Nico Hulkenberg in his Renault. He says: "It feels like I'm losing the brakes. I'm pushing harder and harder, but they don't seem to stop as well."
We have thirty minutes left and the teams and drivers start their long runs. Don't expect too many changes to the fastest lap times from now on today.
Image source, ReutersMcLaren: Sixth and 19th (Alonso and Vandoorne)
Force India: Seventh and 12th (Ocon and Perez)
Renault: Eighth and 10th (Sainz and Hulkenberg)
Haas: Ninth and 13th (Magnussen and Grosjean)
Williams: 14th and 17th (Stroll and Sirotkin)
Toro Rosso: 15th and 18th (Gasly and Hartley)
Sauber: 16th and 20th (Leclerc and Ericsson)
BBC Radio 5 live
Don'f forget to listen to the Azerbaijan Grand Prix Preview on BBC Radio 5 live at 21:00 BST.