Break point Keyspublished at 11:13 Greenwich Mean Time
Keys 3-5 Swiatek*
A really, really crucial next point after Iga Swiatek adds some more zip to her serves to reduce the deficit to 30-40.
Women's singles semi-finals on day 12 of Australian Open
Madison Keys comes from behind to stun Iga Swiatek and reach final against Aryna Sabalenka
Keys saved match point in a 5-7 6-1 7-6 (10-8) over second seed Swiatek
Sabalenka beat Paula Badosa in straight sets to reach final for third year in a row
Sabalenka will also retain world number one ranking regardless of result
Use audio icon for BBC Radio 5 Sports Extra commentary (UK only)
Harry Poole, Joe Rindl and Alicia Turner
Keys 3-5 Swiatek*
A really, really crucial next point after Iga Swiatek adds some more zip to her serves to reduce the deficit to 30-40.
Keys 3-5 Swiatek*
Madison Keys has gone up a notch, her return game is something else.
She thrice pins Iga Swiatek back and then finishes the second seed off with crushing winners. 0-40. What a response!
Keys 3-5 Swiatek*
Pat Cash
Former Wimbledon champion on BBC 5 Live and BBC Sounds
Iga Swiatek has added on a bit more pressure than she would like. She has been breaking serve pretty well but she wants to try and hold on it and get this set right here right now.
Keys 3-5 Swiatek*
Madison Keys stays in the set. She follows an ace up with another unreturnable first serve.
*Keys 2-5 Swiatek
Swiatek tries to go for a big winner but can't find the line. Deuce.
*Keys 2-5 Swiatek
Swiatek pulls Keys way wide of the court, and the American returns a crosscourt forehand long. 30-40.
*Keys 2-5 Swiatek
Gigi Salmon
BBC Sport tennis commentator on BBC Radio 5 Live and BBC Sounds
Iga Swiatek is three points from the set and that's the problem when you play someone like Swiatek, it can get away from you so quickly.
Give her an inch and she will take the mile.
*Keys 2-5 Swiatek
Better. An ace takes us to 30-30.
*Keys 2-5 Swiatek
Iga Swiatek is rushing Madison Keys now, the American, like me at a self-service checkout machine, is making panicked decisions.
Two unforced errors give Swiatek a 0-30 lead.
*Keys 2-5 Swiatek
That'll do for Iga Swiatek who sneaks an advantage and then gets her hold with a finish at the net.
Madison Keys, who hasn't held a service game all match, will serve to stay in the first set.
Keys 2-4 Swiatek*
Iga Swiatek sends over another crisp backhand winner that gets the crowd cheering.
But errors continue to creep in for both players. First Madison Keys hits a backhand long and then Iga Swiatek slices a forehand wide. Deuce.
Keys 2-4 Swiatek*
Pat Cash
Former Wimbledon champion on BBC 5 Live and BBC Sounds
On paper Madison Keys has the perfect game to beat Iga Swiatek, she hits big, she can get round and hit the forehand for winners, she waits for the short ball on the backhand or drill it down the line.
In many ways when you play Keys, the match is on her racquet and she knows it.
Keys 2-4 Swiatek*
Madison Keys saves the first two break points, but can't quite get over the line on the third.
The American isn't able to fully wrap her swing around a forehand down the line and the ball slides wide.
Advantage Iga Swiatek. Keys is yet to hold a serve this match.
*Keys 2-3 Swiatek
Brilliant defence from Iga Swiatek who keeps the ball in play on her way to 0-40.
Three break points.
*Keys 2-3 Swiatek
Pat Cash
Former Wimbledon champion on BBC 5 Live and BBC Sounds
Madison Keys has quite an amazing forehand. It really wraps around at her back swing - the wrist breaks and a lot of power and wrist snap.
*Keys 2-3 Swiatek
Seamless live-texting as we return to the action.
Madison Keys bends over, almost slapping the ground in frustration as she hits a needless error to drop to 0-30.
On potential getting in the history books if she wins her third Australian Open, Aryna Sabalenka said: "On just saying that I have goose bumps, honestly I am so proud of myself and my team that we were able to put ourselves in such a situation.
"It’s a privilege and if I will be able to put my name in the history [books] it’s going to mean the world to me. It’s been a dream, I couldn’t even dream about that to be honest, at first I was dreaming to win at least one Grand Slam and now I have this opportunity and it’s incredible. I am going to go out and give everything I can in the final.
"Thank you so much for the atmosphere, you are amazing and I really love playing in front of you."
On recovering for the final which will be against either Iga Swiatek or Madison Keys, she said: “A protein shake and maybe seven to nine hours [of sleep] and it’s all about having fun on the next day and put aside tennis. I will of course practice a little bit but for the rest of the day I’m going to put aside tennis.”
Change of ends, so let's get the last bit of reaction from semi-final winner Aryna Sabalenka...
*Keys 2-3 Swiatek
Sound the alarm, we've got a hold!
It's almost to love too as Iga Swiatek races to 40-0. After Madison Keys responds, the second seed gets her opponent on the run again and finishes things off with an overhead smash at the net.
Top tennis.
Keys 2-2 Swiatek*
Four breaks in a row. Iga Swiatek takes the next point but still doesn't celebrate.
Game face.
If anything, both players have looked very disappointed with their play over the opening 20 minutes.