Hamilton takes pole, Bottas 2nd, Verstappen 3rd
Hamilton could break all-time race win record at Portimao
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That's all for today. Don't forget to move your clocks back an hour tonight and the race starts at 13:10 GMT on Sunday.
We'll be with you from 11:30 GMT so hopefully you can join us for race 12 of the season.
Thanks for your comments and see you tomorrow morning.
Andrew Benson
BBC Sport’s chief F1 writer
Image source, ReutersLewis Hamilton snatched pole position for the Portuguese Grand Prix from team-mate Valtteri Bottas in a thrilling end to an unusual qualifying.
Hamilton and Bottas ran theoretically slower medium tyres to set their times and a key strategy call by the Briton could have made the difference.
Hamilton chose to do two hot laps at the climax to Bottas' one, and the lead swapped between them as it played out.
Red Bull's Max Verstappen took third, from Charles Leclerc's Ferrari.
Hamilton ended up beating Bottas by 0.101 seconds at the end of an unpredictable and exciting session. It was the 97th pole position of the world champion's career.
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It's a starting spot of seventh for Sainz.
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Mercedes' statistics in 2020.
Qualifying sessions: 12
Pole positions: 12
Front-row lockouts: 9
Races: 11
Wins: 9
Mercedes can clinch the constructors' title with a month and a half of the season still to go tomorrow.
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Romain Grosjean starts 18th tomorrow and is in no mood to be chatty.
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Image source, F1Hamilton takes 97th career pole
Douglas Mcfarlane: Actually looking forward to a race Sunday for a change , if this track doesn't deliver an a exciting race tomorrow F1 is doomed...I sticking my neck out and saying a thriller.
James Ayres: Looks like Lewis is going to add Portimao to the list of circuits he has won at - the longest list in F1?
Philip Murphy: Lewis Hamilton might get to 100 pole positions this year for sure.
Dan Bell: Lewis Hamilton showing yet again that he’s the greatest.
So we could be set for a great start tomorrow as the front row of Lewis Hamilton and Valtteri Bottas will be on the medium tyres, while Max Verstappen is third, looking to jump ahead of them early on, on the softs.
Max Verstappen, who will start third on the grid: "The tarmac is quite difficult to bring the tyres in, so it's a bit hit and miss. I'm happy though.
"I think the lap in Q3 was pretty decent, it's very difficult to get the front tyres and the rear tyres to match but again, P3 is not too far behind and of course a lot to play for tomorrow and hopefully we can stay close.
"Turn One is not really a place to dive. I think the start will be important but even then, we don't really have enough information about how the tyres are going to hold up, so we'll just feel our way into the race and see what's going to happen."
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Valtteri Bottas, who will start the race second, says: "Obviously at the end we decided to go for the mediums. The mediums felt a tiny bit quicker than the softs.
"It was my decision to go for one timed lap [at the end] but it seems like doing two laps for Lewis was better. Mine was a decent lap, not perfect and it has been tricky to get really clear laps. The lap was good but ultimately I should've gone for two timed laps.
"It would've been nice to be on the clean side of the track but I will do what I can from P2."
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Lewis Hamilton, who secured his 97th pole position, said: "It's amazing. I can't tell you how hard that was today.
"I guess we have a great car but you have to drive the nuts off it to pull out a lap. Valtteri has been so quick this weekend, he's topped every session, so I've just been digging and digging trying to find that extra time.
"At the end I chose to do three laps to give me a chance to have a stab and beat his time and I think [Bottas] decided to do one, so I was like 'OK, this could provide me with an opportunity' and it worked. That last lap got better and better as I went through.
"The team communicate really well and gave both of us the option to either go on to the soft or the medium, we both chose to go medium, he chose one lap, I chose to do three. I got out there nice and early.
"The tyres are really hard here this weekend - the hardest of the compound - and getting them to work here is very difficult. That's why I wanted an extra run, just in case it didn't work out.
"The track is hardcore. There are places you can't see where you are going. It really is one of the hardest circuits I've been too. The surface is strange. This is a very smooth surface and doesn't work the tyres the same as say, a Barcelona."
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Mercedes have now taken pole position at all 12 of this season's races so far and that's the ninth of the season for Lewis Hamilton.
He needs three poles in the final five races of 2020 to reach an incredible century.
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Hamilton on pole
Adrian Priestly: Hamilton demoralises Bottas AGAIN.
Deeda: On the mediums! Get in there Hamilton. Pure brilliance!
Josh Earl: Hamilton pulls it out of the bag once again! Flawless lap.
Jolyon Palmer
Former Renault driver on BBC Radio 5 live
What a lap from Lewis Hamilton. Two laps on the mediums! Hamilton, with that second lap, went out earlier from the pits so had time to snatch the pole position from under the nose of Valtteri Bottas.
That is pole position number 97 for Lewis Hamilton, absolutely incredible numbers.
He could still get to 100 by the end of the year!
At the absolute last second, Lewis Hamilton nails it. Superb, once again.
Hamilton on pole. Bottas second. Verstappen third. What drama.
Jolyon Palmer
Former Renault driver on BBC Radio 5 live
It's between the two Mercedes!
Bottas to the top. Hamilton still has one last chance.