Jonathan Jurejko
BBC Sport tennis news reporter in Melbourne

When Aryna Sabalenka was unable to convert those three break points at 1-0 in the second set, she merely pursed her lips and rolled her shoulders.

It seemed then like she was buoyed by creating the chances and perhaps confident that more would come her way.

That's what happened.

Sabalenka hasn't managed to lure Elena Rybakina forward loads, but when she has it has been helpful that the fifth seed has not looked comfortable - illustrated by what happened on set point.

As we wait for the start of the decider, who do you think will win the title?

Hit the thumbs on this post - thumbs up for Aryna Sabalenka, thumbs down for Elena Rybakina.

Both players left the court at the end of the second set.

All square!

Aryna Sabalenka stepped it up when she needed to and Elena Rybakina had no answer.

A break to love sends this year's Australian Open final into a deciding set.

Image source, Getty Images

Pat Cash
Former Wimbledon champion on BBC Radio 5 Live

I think Aryna Sabalenka is doing really well in terms of keeping her emotions in check.

Things don't always go your way in Grand Slam finals - and you just have to ride it. It is very rare to see both players playing their best tennis in a final.

She is doing well to hang in there and find a way. She is coming up with big serves time and time again. She will get an opportunity and she has to keep believing that.

And now three set points for Aryna Sabalenka as Elena Rybakina goes wide and long on the forehand.

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Brilliant from Aryna Sabalenka, who chases down a lost cause, before Elena Rybakina nets a timid drop shot.

Then Sabalenka finds the line with a forehand winner.

0-30.

A chance.

Vintage Aryna Sabalenka, sending Elena Rybakina running this way and that before pummelling down a backhand winner.

The world number one has a 5-4 lead in set two and will, in all likelihood, swing with a bit of freedom in the next return game - knowing if she wins it, she'll level the match.

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Annabel Croft
Former British number one on BBC Radio 5 Live

When I've watched Aryna Sabalenka in matches recently and the scoreline has been a little bit tight, she never ever holds back.

She is a very brave tennis player who loves to put her heart and soul on the line. She trusts and backs herself because she knows what she can do in practice and she knows she can reproduce it when it really matters.

She lives by the sword and dies by the sword - but she isn't in control here at all.

More words towards her coaching box from Aryna Sabalenka as a drive volley clips the top of the net and lands back on her side.

The third and fourth aces of the match for Elena Rybakina and we're back level once again in the second set.

Some critical moments coming up now - one minor slip could decide the destination of the title.

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Aryna Sabalenka sees out the game from deuce. No damage done, still on serve in set two.

Given Sabalenka has won her past 20 tie-breaks in Grand Slams, she might not mind if it goes that far...

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A possible chance missed for Elena Rybakina at 15-15 and on second serve.

She goes for the big backhand down the line but finds the net.

Then Aryna Sabalenka gets the better of a great point during which both players exchange volleys at the net, but a double fault and a Rybakina winner down the line - she gets the return right this time - take us to deuce.

Annabel Croft
Former British number one on BBC Radio 5 Live

We saw Aryna Sabalenka rant towards her coaching box a couple of points ago, which tells you that she is feeling uncomfortable.

Things aren't going her way and she's finding it really hard to get stuck into this match. Whatever she thought she needed to do just hasn't worked.

The crowd are really behind Elena Rybakina. They are enjoying how she is hitting from the back of the court.

Image source, Getty Images

Jonathan Jurejko
BBC Sport tennis news reporter in Melbourne

Earlier I mentioned it would be interesting to see how Elena Rybakina fares under pressure tonight.

So far, after serving out the opening set without drama and seeing off five break points, she is passing with flying colours.

So far...

It is also worth pointing out she has won her past 24 matches after claiming the first set.

And she has won her past nine meetings with top-10 opponents - including Sabalenka for the season-ending WTA Finals trophy.

Elena Rybakina demonstrates her powerful groundstrokes once more, getting Aryna Sabalenka scurrying from side to side.

A hold to 30 for Rybakina as a tight second set continues.

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Frustration for Aryna Sabalenka as some excellent Elena Rybakina defence somehow earns her a point to take it to 40-30 in her latest service game.

But a fine serve forces Rybakina to go wide on the forehand side, sealing another hold.

Image source, Getty Images

Annabel Croft
Former British number one on BBC Radio 5 Live

Aryna Sabalenka is probably at a seven out of 10 at the minute, if I'm honest.

I sense that she has a lot more gears that she can go to, but there is always the case that you can only raise your game as much as you're allowed to.

She will be frustrated because things haven't gone the way she hoped and she hasn't got the breakthrough, but she will be trying to stay composed and patient.

I would say Elena Rybakina is at about an eight out of 10.

Having somehow escaped from her previous service game, a comfortable service hold to 15 will make Elena Rybakina feel a whole lot better about things.

She throws in her third double fault of the match, but otherwise it's solid stuff from the fifth seed.

Image source, Getty Images

An hour played under the roof on Rod Laver Arena and, other than that flying start made by Elena Rybakina, it's been every bit as close as most of us thought.