Calm and composed, even in the heat at Wimbledon, Karolina Muchova gets another forehand right out of the screws for a winner.

That secures another stress-free hold and keeps it on serve in the second set.

Right, you know what's up next on Centre, don't you? Of course you do.

Youth might be on his side - and in fairness, so is his world ranking - but one look at two of the stats above will show what a task Felix Auger-Aliassime faces today.

His run to the quarter-finals has matched his previous best ever Wimbledon performance - but now seven-time SW19 champion Novak Djokovic stands in his way.

A man whose career trophy haul runs into triple figures. Time, of course, is his main adversary in attempting to add to that tally. But he'll see the lush grass courts of London as one of his better chances to do so.

World number three Alexander Zverev, speaking on Centre Court after beating Jiri Lehecka to reach his first-ever Wimbledon quarter-final:

"Who would've thought it would've taken me only 12 years to get here? I'm incredibly happy and relieved to achieve that, but of course I want to play three more matches here.

"It was a fantastic match that lasted two days, and of course it is never easy to come back on the following day. I thought Jiri [Lehecka] played amazingly today, so credit to him for keeping the fight up and making it very difficult for me.

"For me, it was a bit difficult [to get going again today]. I lost the first three games and I gave away the third set, but again he came out playing incredible tennis and he came out swinging so credit to him. He did a fantastic job in that aspect. I'm just happy to be through in four sets and I'm glad I didn't have to play another set.

"I think it is more difficult mentally than physically not having time to breathe, realise what's happening and prepare for the next match. Playing back-to-back days, especially best of five sets, isn't easy but I'm very happy to be playing tomorrow. That's the most important thing. I hope I'll be back on this wonderful court and playing my best tennis again."

On what sort of match he expects against Taylor Fritz: "Probably not a very entertaining one! We both serve 140mph so I would expect there won't be many rallies. At the end of the day, this is grass court tennis so everything very fast. I'm going to do everything I can to be playing my best tennis tomorrow."

It was far from easy but Naomi Osaka comes through to hold.

Karolina Muchova is a set up and looks the stronger of the two so far. But these things can change very quickly, which is why she'll be disappointed not to have converted that break opportunity.

Annabel Croft
Former British number one on BBC Radio 5 Live

I think Osaka feels out of control of it. If we think back to the match against Sabalenka, she was blasting the ball and it was coming at her a pace she feels comfortable with. Muchova is just completely disrupting that and as a player, you want to feel in control.

She will have to dig deep for this one.

Harry Poole
BBC Sport at Wimbledon

Lots of love for Naomi Osaka here, and she receives another round of rousing cheers from the Court One crowd after going 0-30 down on serve.

Her frustration is becoming more and more evident, though, as Karolina Muchova continues to be completely unfazed by any of that.

Chance for Karolina Muchova!

An excellent return at deuce, she comes in behind it but then dumps a relatively simple volley into the net.

Naomi Osaka, who had found herself down 0-30, looks to the skies after sending a backhand long to take it back to deuce again and a searing forehand return from Muchova brings up break point.

Osaka saves it with a hefty first serve.

Marion Bartoli
Former Wimbledon champion on BBC Radio 5 Sports Extra

It felt really difficult towards the end of the match. You could tell Zverev knew what the gameplan was. He did feel flatter than yesterday, he wasn't as dominant from the backcourt. I thought he did really well to handle the pressure after that double fault.

It's reassuring to see him not go of the rails and just playing that solid tennis from the back of the court, good serving.

He'll be pleased overall but will want to be more aggressive if he wants to continue in this tournament.

Arthur Fery will be back on Centre Court on Wednesday for his Wimbledon quarter-final against French Open finalist Flavio Cobolli.

The British wildcard will be involved in the second match on Wimbledon's showpiece court.

Cobolli is the ninth seed at Wimbledon this year but Fery defeated him in the first round of the Australian Open in January.

Centre Court (from 13:30 BST)

• Marta Kostyuk v Jasmine Paolini
• Flavio Cobolli v Arthur Fery

Court One (from 13:00 BST)

• Linda Noskova v Elise Mertens
• Taylor Fritz v Alexander Zverev

Todd Woodbridge
Former Wimbledon doubles champion on BBC One

There is always a psychological barrier in the way for a player, which brings a little bit of nervous tension, and perhaps it was just that for Alexander Zverev.

His goal has always been to reach a quarter-final here at Wimbledon and this place has always been challenging for him, so well done.

It was a difficult reset for him, and we anticipated it would be because that is his pattern, but his serving was very good.

After four breaks in a row to start the first set, there is no such drama in the second.

A straightforward hold for Karolina Muchova, sealed with an ace out wide.

• Jannik Sinner is two wins away from defending his Wimbledon title - the world number one beat Jan-Lennard Struff in straight sets to secure a semi-final spot.
• Alexander Zverev was taken to four sets by Jiri Lehecka in a fourth-round match that was held over from Monday - the German will play Taylor Fritz in the quarter-finals on Wednesday.
• Coco Gauff beat fellow American Jessica Pegula in a deciding set to reach the Wimbledon semi-finals for the first time in her career. Gauff, seeded seventh, is the highest seed left in the women's draw.
• Great Britain's Henry Patten and Finnish partner Harri Heliovaara are into the men's doubles semi-finals, although the top seeds needed to win a deciding-set tie-break to progress.
• Alfie Hewett and Andrew Penney won in the first round of the men's wheelchair singles but Gordon Reid and Ben Bartram were eliminated, while Lucy Shuker and Cornelia Oosthuizen lost in the women's event.

Chris Bradnam
Commentator on BBC One

Alexander Zverev has done it! He hasn't won the title, but he has won the battle of making the Wimbledon quarter-finals for the very first time. He has backed up his French Open triumph.

You can see from his reaction that it was a mighty effort, but he is there.

Strong service game to start the second set for Naomi Osaka.

That is just what the four-time major winner would have wanted.

Harry Poole
BBC Sport at Wimbledon

Naomi Osaka watches Karolina Muchova’s finishing forehand winner fly past her and quickly signals to the chair umpire that she’ll be leaving the court between sets.

It’s been a great tournament so far for Osaka, but she is certainly not having it all her own way here and turning this around is going to require a huge effort.

Muchova heads over to speak with her team, clearly not bothered at all by the still intense early evening sun.

Todd Woodbridge
Former Wimbledon doubles champion on BBC One

What Alexander Zverev fails to capitalise on is the pressure he places on his opponents.

It is there but he doesn't squeeze it, if you like.

He will - a big serve forces Lehecka's return to go long.

Match point number three...

Goodness! A double fault from Zverev! Two match points gone, will he get any more?

Karolina Muchova takes an absorbing first set on Court One.

Great tennis from both players but Muchova just edges it. Superb ball striking and excellent returning.

This has been so enjoyable to watch. Naomi Osaka has dropped a set for the first time at this year's championships but don't rule out a comeback just yet.