Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds

It has probably been a shock to the system for Eva Lys.

We have all been admiring how Lys hits the ball. Technically, it all looks quite sound and she has got a lovely looking game but she is coming up against so much pressure with the pace, timing and tempo of the match.

I think the difficulty for her is not having a big serve, instead they are well-placed and they sit up rather invitingly.

She doesn't really put too much pressure on Swiatek with where she is putting the ball and there isn't enough pace on them to put it out of her reach.

The good news for Eva Lys is that the last game, which lasted over 10 minutes, might make sure she lasts past the hour mark against Iga Swiatek.

Image source, Getty Images

Russia's ninth seed Daria Kasatkina has levelled her fourth-round tie with American eighth seed Emma Navarro, saving three match points in the second set.

The pair traded multiple breaks of serve with Kasatkina three times on the brink of defeat, but she fought back magnificently to take it to a decider.

The pair are aiming to reach the last-eight in Melbourne for the first time.

What a point from Eva Lys. The crowd appreciated that one as the lucky loser sends Iga Swiatek out wide, and then wider again and eventually even she can't get a return away.

But that's as good as it gets for Lys, with Swiatek taking the break.

She's one game away from the quarter-finals. Can she serve it out?

Eva Lys keeps moving one point away from grabbing the hold, but she just can't make the most of it and now Iga Swiatek has got herself a break point.

Back and forth we go. Iga Swiatek is unwilling to let this game go.

But Eva Lys has another chance to get the hold across the line as the second seed fires wide.

Lovely stuff from Eva Lys, who takes charge of the rally before lashing a forehand winner across the court.

But Iga Swiatek takes us back to deuce and Lys shakes her head in frustration.

Back-to-back misses from Iga Swiatek keep Eva Lys in the game. We go to deuce.

Iga Swiatek gets very lucky with the net cord there and all Eva Lys can do is shrug her shoulders.

The Pole opens up a 0-30 lead as Lys goes long, but the German slams down an overhead at the net to claw back a point.

A double fault comes next and there's two chances for Swiatek to break.

There's not much hope for Eva Lys on Iga Swiatek's serve though.

The reigning French Open champion goes on the attack and comes out the other end with a love hold.

YES! Eva Lys is on the board and she's got a massive smile on her face.

Lys punishes Iga Swiatek for not putting away the point sooner, unleashing a forehand winner down the line and leaving the Pole rooted to the spot.

Swiatek can't deal with her next serve and then there's a huge roar from the crowd as the second seed nets to hand Lys the game.

At least she'll avoid the double bagel now.

Image source, Getty Images

Eva Lys plants into the net before Iga Swiatek launches herself into another winner.

She's now won 20 games in a row, after her 6-1 6-0 win over Emma Raducanu in the previous round.

The good thing is Eva Lys is still smiling. It was always going to be a big ask beating five-time major winner Iga Swiatek on Rod Laver Arena, but it looks like she's trying to make the most of the experience.

There's just no stopping Swiatek at the moment and the Pole looks acrobatic as she dashes to the net and smashes home.

But, don't rule Lys out just yet. The German flings down a forehand winner and takes us to deuce.

Image source, Getty Images

Gael Monfils' exciting run at the Australian Open is over with the Frenchman retiring in the fourth set against American 21st seed Ben Shelton.

Monfils, 38, moved gingerly through the latter half of the third set and appeared to have nothing left by the fourth.

Shelton, who's into his second quarter-final in Melbourne, is 16 years younger than Monfils and paid tribute to him in his post-match interview.

"I’ve watched him since I was a little kid. I always say he has the greatest highlight tape of all time," said Shelton.

And there it is. A swipe at the backhand kisses the line and Iga Swiatek strikes first in the second set.

David Law
Commentator on BBC Radio 5 Live and BBC Sounds

It is quite awesome to watch Iga Swiatek in this kind of form.

She isn't a stranger to 6-0 and 6-1 sets. There is a joke that goes around social media about Iga's 'bakery' because she is always getting bagels and breadsticks in her scorelines!

Fair play to Eva Lys, who is playing her heart out and still smiling. She is trying to make the best out of this opportunity, having had a great run.

I don't think she could be doing any more than what she is doing.

Utter dominance from Iga Swiatek as she controls the point from the baseline, sending Eva Lys to one side of the court and then back the other way. It's almost like she's toying with the German.

Lys lets out an agitated yell as she loops her backhand wide.

Two break points for Swiatek.

Iga Swiatek picks up where she left off, with a double fault the only blip in an otherwise comfortable service game.

Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds

It's going to be a shock to Iga Swiatek's system when she loses a game!

But it's hardly surprising because she plays with such intent on every single point. You can tell from her body language, her footwork skills, her work-rate, her preparation on the racquet and the energy she is putting into every single point.

At the moment, we are watching perfection in terms of what she is putting out onto this court.