Well then. Alex de Minaur didn't have to do much there. Three misses on the spin from Carlos Alcaraz gift the Australian three chances to pull the break back.

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra

With the roof open, the temperature is still well above 35C but the Australians are still finding their voice just in front of us.

Image source, Reuters

A huge roar inside Rod Laver Arena as their home hope gets himself on the scoreboard.

None of these service games are going to be easy for Alex de Minaur, but he manages to claw his way through that one.

Two misses from Alex de Minaur and it looks like Carlos Alcaraz is on his way to a straightforward hold of serve.

But the top seed's progress slows with a sudden double fault.

He gets the job done, though, with De Minaur sending a backhand long.

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra

It is Alcaraz's one and only opportunity to become the youngest man in history to win all four Grand Slam titles.

If he doesn't do it, he will at some point - but he will be older than Don Budge when he completed the clean sweep in 1938.

Pat Cash
Former Wimbledon champion on BBC Radio 5 Sports Extra

There is no feeling each other out, this is like two boxers coming out and laying into each other straight away. They are getting straight into it.

Image source, Getty Images

Carlos Alcaraz works Alex de Minaur from one side of the court to the other, while he gradually moves up to the net.

And from there he's able to dink a forehand out of De Minaur's reach.

What a point that was. Alex de Minaur was in control until the ball clipped the net and handed the power back to Carlos Alcaraz, but the sixth seed stays in it and turns defence back into attack before Alcaraz goes wide.

Alcaraz works his way back to deuce and he brings up a first break point with an acrobatic pounce at the net.

Carlos Alcaraz opens up a 0-30 lead as he capitalises on Alex de Minaur's tamer second serve, but the Australian home hope gets back level after a couple of misses from the world number one.

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra

Carlos Alcaraz is trying to make his 10th Grand Slam semi-final tonight.

He will almost match Rafael Nadal's open era record of being the youngest player to reach 10 semi-finals.

Nadal beats him by about a month, even if he wins tonight.

A sign of things to come? Carlos Alcaraz pierces a forehand winner down the line on the first point - one that even the speedy Alex de Minaur can't reach.

That sets the Spaniard up nicely and he rattles away an ace and another winner to grab the hold.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

Alcaraz is not used to playing a match like this [against the home favourite], but he is a bit like Roger Federer - wherever he goes, he still manages to take the crowd with him.

I don't think there will much against him today. Of coruse they will cheer for De Minaur, but they love Alcaraz's tennis.

Here we go then.

Alex de Minaur won the coin toss but he's elected to receive, so it will be Carlos Alcaraz who gets this quarter-final up and running.

Which player is going to make it into the semi-finals in Melbourne for the first time? Let's find out...

*denotes next server

Alex de Minaur is the last Australian standing in the men's or women's singles.

The sixth seed, playing in his second quarter-final in Melbourne, is aiming to become the first Australian man to lift the singles trophy for 50 years.

Like de Minaur, Alcaraz has never previously gone beyond the last eight at the Australian Open - a surprising stat in his storied career - but the six-time major champion, who boasts a 5-0 record over the Australian, head into this match as the overwhelming favourite.

Image source, Getty Images

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

I admire De Minaur's work ethic. He is one of the fittest and fastest players you will ever see on a tennis court - but he is up against somebody who is probably the fastest I have ever seen!

Listen to live Australian Open commentary on BBC Radio 5 Sports Extra and via the link at the top of this page.

Image source, Getty Images

The big challenge for Alex de Minaur will be making inroads on Carlos Alcaraz's serve.

The Spaniard has maintained a first-serve percentage above 70% in his past two matches and has won at least 70% of points behind his first serve in three of his four matches (peaking at 79% against Tommy Paul in round four).

And he's not even looking vulnerable with his second serve, winning at least 60% behind it in all but one match.

"I'm surprising myself to be honest," said the six-time Grand Slam champion, who is yet to drop a set during his first four matches in Melbourne.

"After every set, I try to take up my percentage, I look at the screen after every set. In general, [in] the four matches I've played, the serve has been an important weapon for me."

Image source, Getty Images

Alex de Minaur has played in six Grand Slam quarter-finals. He has lost all of them.

Will it be seventh time lucky today? He'll have to beat the world number one.

I'd say Carlos Alcaraz and Alex de Minaur were both thinking it would be a longer wait until they were on court today.

But Elina Svitolina's 59-minute demolition of Coco Gauff means they're already out on Rod Laver Arena.

Image source, AFP via Getty Images

Elina Svitolina spoke on court after a victory which sent her into the Australian Open semi-finals: "Not a bad day in the office!

"I am very pleased with the tournament so far and it was my dream to get back into the top 10 after maternity leave. It didn't happen last year, but in the off-season, I told my coach I still wanted to get back to the top 10. That was my goal this year.

"It means the world to me. I try to push myself and motivate myself to continue. Overall, it has been a good trip and I am really happy to go through to the semi-final."

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

That was a total annihilation. Svitolina could not have played any better than she did.

There was so much to admire in her game; great serving, great returning of serve and very mentally strong at the beginning of the match when there was all of the long exchanges.

Gauff must be in such a fluster. Her serve disappeared, her forehand evaporated and she didn't know how to stop the rot.