Postpublished at 12:23 British Summer Time 29 April 2018
That pole position from Sebastian Vettel was his 53rd of his career, still 20 less than Lewis Hamilton.
Hamilton wins epic race, Raikkonen 2nd, Perez 3rd, Vettel 4th
Red Bulls crash out following collision on straight
Grosjean crashes out under safety car
Several first-lap collisions; Ocon, Sirotkin, Hulkenberg, Bottas out
Michael Emons
That pole position from Sebastian Vettel was his 53rd of his career, still 20 less than Lewis Hamilton.
Meanwhile, Brendon Hartley, a two-time world endurance champion and driver of considerable experience and expertise, held his hands up and took responsibility for the incident.
"It was a disaster; pretty upset about that," he said. "I clipped the inside wall and through the left hander. I knew I had an issue and slowed down. I was unaware Pierre was so close behind me.
"Obviously I was going half speed, trying to figure how bad the problem was and I completely messed it up. The problem is, with the walls, you don't see them coming.
"I made a big mistake, I'm sorry for him. I owe him a big apology for getting in the way and nearly causing a huge accident. I'm disappointed how that went down. Not a good day."
Pierre Gasly looked a bit shaken up when he spoke to reporters later on after that near-miss with Brendon Hartley.
"It was really scary - the scariest moment of my career," Gasly said. "I didn't know if he was going left or going right. I don't know what happened to Brendon; he slowed down massively. I was at 320km/h and, honestly, he almost stopped.
"I tried to avoid him and I was sure I was going to crash. I could already see myself in the air, I don't know how I avoided it, but it was a pretty scary moment.
"I am sure he didn't do it on purpose, but he was on the line, I wasn't sure if he was going to go on line or not."
It was a hide-your-eyes-behind-your-hands moment for those watching on television and absolutely terrifying for those on the track.
One of the most dramatic moments of qualifying yesterday was when Toro Rosso's Pierre Gasly, going at full speed at more than 300km/h, nearly went straight into the back of team-mate Brendon Hartley, who had a puncture and was ambling along slowly in the middle of the track on the racing line.
Not knowing Hartley's intentions, Gasly first went left, for the inside, and then right, for the outside to try to avoid him. He was largely successful, the Frenchman's left front wheel striking a glancing blow on Hartley's right rear as he passed, the car mercifully remaining on the ground.
Earlier today, Great Britain's George Russell won the 45-minute long sprint race in the FIA Formula 2 Championship in Azerbaijan.
Russell, 20, who is part of the Mercedes Young Driver Programme, finished in front of Brazilian Sergio Sette Camara and Dutchman Nyck de Vries, who has a development position at McLaren.
It was only Russell's second weekend of competing in Formula 2, a championship which was won by Charles Leclerc in 2017 before his promotion to Formula 1 with Sauber.
Great Britain's Lando Norris and Jack Aitken came fifth and 12th respectively in the sprint race.
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Fifty-one laps of carnage, overtakes and stunning moves coming up, maybe.
Three races out of 21 have gone and this is how it stands with Ferrari's Sebastian Vettel leading the drivers' championship, although Mercedes are top of the constructors' championship.
What is going to happen today?
Unpredictable conditions, temperamental drivers, a tight track.
Only a fool would ask you to predict what's going to happen...
So, what's going to happen today?
Tweet us using the hashtag #bbcf1 and we will put your thoughts in this page throughout the afternoon.
Andrew Benson
BBC Sport’s chief F1 writer
They call Baku the ‘windy city’ - let’s just forget about Chicago for a moment, shall we? - and on Sunday it is living up to its name. My good friend and colleague Tom Clarkson has won the battle to best demonstrate the extent of the wind on social media, with a nice little film of his suitcase - which we call ‘the yellow peril’ - being blown along a pavement., external
It’s harder to demonstrate the effects of strong winds on an F1 car, but their disruptive influence on aerodynamics are even more dramatic. In fact, the gusting northerly ‘khazri’ wind was almost certainly partly to blame for the wild moment at Turn 16 that cost Ferrari's Kimi Raikkonen pole on Saturday.
And on Sunday it is much stronger. With some areas of the track sheltered and some exposed to a wind accelerated through the gaps between buildings, the race could be a harum-scarum ride for the drivers.
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Not forgetting Esteban Ocon, Marcus Ericsson and Valtteri Bottas.
And here were tweets from Kevin Magnussen, Sergio Perez and Lewis Hamilton.
These were the thoughts of Max Verstappen, Romain Grosjean, Stoffel Vandoorne and Nico Hulkenberg after yesterday's qualifying.
This is how they line-up, with Nico Hulkenberg dropping down from ninth to 14th on the grid because of a gearbox change and the resulting five-place grid penalty.
When will we see Sebastian Vettel and Lewis Hamilton go head-to-head in Baku this time around? Well, you won't have to wait long. The first corner in fact, after qualifying yesterday saw them both get on the front row.
Things got heated between Lewis Hamilton and Sebastian Vettel in Baku last year.
"If he wants to prove he is a man we should do it out of a car, face-to-face," said Hamilton.
Listen again below to Hamilton's extraordinary interview immediately after that race where he accused Vettel of "disgusting driving".
It came after Vettel went alongside the Brit and deliberately drove into him after the German thought Hamilton had "brake-tested" him.
Remember last year's race in Azerbaijan. It was nuts.
Sebastian Vettel was penalised for deliberately driving into Lewis Hamilton in a chaotic and incident-packed Azerbaijan Grand Prix before a loose head restraint cost the Briton victory. A remarkable race that featured three safety cars and several crashes, including clashes between team-mates, was won by Red Bull's Daniel Ricciardo.
Vettel was given a 10-second stop-go penalty for swerving into Hamilton's Mercedes as they prepared for a restart at the end of one of three safety car periods in Baku.
But the time Hamilton lost being forced to pit for a new head restraint put him behind Vettel. He followed him past a number of cars as they recovered positions, and closed up as the race entered its final lap, but the Englishman was not able to pass.
Hamilton ended up finishing fifth, a place behind Ferrari's Vettel, and lost two points to the German. He is 14 points behind after eight of 20 races.
Hamilton's Mercedes team-mate Valtteri Bottas, who was last and lapped after the first lap, passed Williams driver Lance Stroll for second on the final straight as the 18-year-old Canadian scored his first podium in his eighth race after a mature drive.
Hello and welcome along to what looks like being a fantastic day of Formula 1 action.
I'm Michael Emons and I will be guiding you through all the events from the Azerbaijan Grand Prix.
We have live radio commentary as well later on.
Three races gone in the 2018 season and Sebastian Vettel has two wins to his name and sits on pole position today for the Azerbaijan Grand Prix.
But this is not going to just be a procession, no way.
World champion Lewis Hamilton is on the front row next to Vettel, the weather conditions are going to be tricky, the track is incredible tight and this was the setting for one of the most remarkable races of 2017.
This is going to be good, very, very good.