Oh no. A double fault from Zheng Qinwen hands Dayana Yastremska another break point.

Can she get it this time?

Back to deuce we go as Zheng Qinwen forces the error from her Ukrainian opponent.

Here's a third break point for Dayana Yastremska as Zheng Qinwen finds the net.

Dayana Yastremska misses the first. Then she nets the second. Deuce.

Image source, Reuters

Zheng Qinwen has hit more aces than any other women's singles player at this year's Australian Open with a whopping 44.

No luck so far for the Chinese 12th seed as Dayana Yastremska goes 15-40 up.

Two break points.

Chanda Rubin
American former world number six on BBC Radio 5 Sports Extra and BBC Sounds

Dayana Yastremska has played some top players, players who are in form, and has made her way through the draw to make this stage.

It looks like Dayana Yastremska is well on her way to a comfortable hold to love, but two misses pulls Zheng Qinwen back to 40-30.

However, the Ukrainian polishes off the first game off with an ace. That will help with any early nerves.

Image source, Reuters

So, who will Aryna Sabalenka meet in this year's final? Let's find out.

Dayana Yastremska serves first to get us started. Away we go...

Image source, Getty Images

Dayana Yastremska and Zheng Qinwen obviously share a love of tennis, but they also have similar interests off the court as well. They both love singing.

Yastremska even plans to release a song next month: "It's not just mine. It's gonna be three of us, from three different countries, who got together.

"I'm not going to talk much about it. You're going to hear it soon, I hope."

Meanwhile, Zheng serenaded jubilant home fans after winning the WTA title in Zhengzhou last season.

The Chinese 12th seed also lists karaoke as one of her favourite things to do.

In English, her go-to track is Eminem and Rihanna's 'Love The Way You Lie'. "For Chinese it's difficult to pick," she says.

Let's see which player brings the X Factor today...

Image source, Getty Images

Chanda Rubin
American former world number six on BBC Radio 5 Sports Extra and BBC Sounds

Qinwen Zheng is very, very charismatic. She's always had that star quality in just the way she carries herself. The shoulders are back and she's not very scared of any moment. She's very ambitious and very, very charming.

Ten years ago, trailblazing Chinese star Li Na won the 2014 Australian Open and it would be fitting if Zheng Qinwen marked the notable anniversary with her own triumph.

The Chinese 12th seed - an aggressive baseliner with a hefty serve - is aiming to follow in Li's footsteps by becoming only the second Chinese woman to win the title.

During her post-match media duties after her third-round win, Zheng was standing in front of a camera when former world number two Li sneaked up and playfully tapped her.

Zheng, who says she has watched Li's famous Melbourne victory "more than 10 times", revealed it was the first time she had properly met her idol.

"She said to me 'don't think too much, just keep simple'," said Zheng. "That's what I'm trying to do. If you really focus on the basics, you will show good things in the tennis."

Image source, Getty Images

After sweeping past Czech teenager Linda Noskova, Dayana Yastremska became the first qualifier to reach a Grand Slam semi-final since Britain's Emma Raducanu, who famously went on to win the 2021 US Open.

What Raducanu achieved is unparalleled. Yastremska is two wins away from matching it.

Unlike Raducanu in New York, Yastremska already has pedigree on the WTA Tour.

She reached a career-high 21st in the world in January 2020 but a six-month provisional ban for a failed doping test - which was later lifted - and the effects of the war in her country saw her drop down the rankings.

Image source, Getty Images

Up against the defending women's champion, we're guaranteed a first-time finalist at the Australian Open.

But who will it be?

Next up on Rod Laver Arena, China's 12th seed Zheng Qinwen and Ukrainian qualifier Dayana Yastremska are set to play the biggest match of their careers.

Image source, Getty Images

Here is what Aryna Sabalenka had to say after defeating Coco Gauff to reach the Australian Open final:

"I think I was able to focus on myself and I was preparing that Coco Gauff is going to move really good and she's going to put all balls back to me and I just have to be ready to play an extra shot.

"I was just ready for anything tonight and I think that was the key and definitely your support guys. Last time I played here I didn't have almost any support and today guys, thank you! It's definitely felt like home. Thank you so much. I really appreciate the support and atmosphere. You make this place feel really special."

On her rivalry with Gauff, she added:

"As I said before, it's always a great fight. She's an incredible player. I really enjoy playing her. Win or lose, it's always great matches. She's a great player.

"I really hope that in the future we're going to play many more finals and I mean hopefully I'm going to win all of them! I really enjoy playing her."

And lastly, on playing in front of women's tennis legends including Billie Jean King and Evonne Goolagong Cawley on Rod Laver Arena tonight:

"I couldn't dream to play in front of you guys. Thank you so much for everything you've done for our sport. It's a privilege to play in front of you. Thank you so much."

Pat Cash
Former Wimbledon champion on BBC Radio 5 Sports Extra and BBC Sounds

Image source, Getty Images

Aryna Sabalenka is experienced enough now to keep it together. We've seen some horror shows in the past with her spraying balls everything.

She's playing well enough. I wouldn't say that was a high quality match by any stretch of the imagination but she got the job done by serving well and doing just enough to get by.

While on a personal note Aryna Sabalenka has the revenge she sought after a painful US Open final defeat in September, she is now in a great position to win her second major title - and second here in Melbourne.

She awaits either Chinese 12th seed Zheng Qinwen or Ukrainian qualifier Dayana Yastremska in the final - neither of whom have any experience at this stage of a major.

Sabalenka is only the second player this Century to reach three or more consecutive hard court Grand Slam finals in the women's singles after Victoria Azarenka, who won four between the 2012 Australian Open and 2013 US Open.

And, guaranteed to remain as world number two after seeing off Coco Gauff, she could not be in better form before Saturday's title-decider.

Aryna Sabalenka becomes the first women's singles player since Serena Williams in 2016-2017 to reach back-to-back finals at the Australian Open.

But it's disappointment for Coco Gauff, who had hoped to become the first women's player since Naomi Osaka in 2020-21 to win the US Open and Australian Open back-to-back.

It's the Belarusian who prevails in the latest chapter of what is developing into quite the rivalry.

An ace gives Sabalenka a second match point.

Image source, Getty Images

Coco Gauff won't go away just yet.

That is an unbelievable way to dismiss a match point, moving Sabalenka around before driving a forehand down the line.