'Absolutely remarkable'published at 15:33 BST
*Muchova 6-2 1-6 4-4 Gauff
Tracy Austin
Two-time Grand Slam champion on BBC One
Coco Gauff at the net has been absolutely remarkable.
She has made it very uncomfortable for Muchova to hit clean passes.
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LIVE: Karolina Muchova 6-2 1-6 Coco Gauff in first women's semi-final
Followed by: Marta Kostyuk v Linda Noskova
Great Britain's Alfie Hewett through to wheelchair singles semi-finals with 6-4 6-1 win over China's Ji Zhenxu
Henry Patten plays alongside Harri Heliovaara in men's doubles semi-final later
British wildcard Arthur Fery's men's singles semi-final against Alexander Zverev to be played on Friday (13:30 BST)
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Emma Smith, Phil Cartwright, Nicola Pearson & Marissa Thomas
*Muchova 6-2 1-6 4-4 Gauff
Tracy Austin
Two-time Grand Slam champion on BBC One
Coco Gauff at the net has been absolutely remarkable.
She has made it very uncomfortable for Muchova to hit clean passes.
*Muchova 6-2 1-6 4-4 Gauff
Marion Bartoli
Former Wimbledon champion on BBC Radio 5 Live
Coco Gauff is willing to make the move forward and play bold tennis.
We know her for incredible skills from the back of the court but she keeps coming to the net and winning points.
Quite extraordinary.
*Muchova 6-2 1-6 4-4 Gauff
If Coco Gauff breaks here, she will serve for a place in the Wimbledon final.
*Muchova 6-2 1-6 4-4 Gauff
Coco Gauff responds to that imperious Muchova game with some strong serves of her own, moving into a 30-0 lead.
It becomes 40-0 as Gauff wins a volley, seeing off an attempted Muskova lob with a controlled overhead winner. And the hold to love with a lovely stunned drop shot!
That was Gauff's best game of the match so far.
Image source, Getty ImagesHeliovaara/Patten 2-1 Kokkinakis/Kovacevic*
Great Britain's Henry Patten and Finland's Harri Heliovaara are the joint world number ones in doubles and will retain that top ranking, regardless of the outcome of their Wimbledon campaign.
It's 2-1 on serve in the early stages of their men's doubles semi-final on Court One against Thanaski Kokkinakis of Australia and Aleksandar Kovacevic of the United States.
Muchova 6-2 1-6 4-3 Gauff*
Karolina Muchova again had the ice pack to the top of her head during the change of ends. It is blisteringly hot in Wimbledon today.
Who can keep their cool?
Muchova 6-2 1-6 4-3 Gauff*
Coco Gauff, after a few misses, finally gets a smash right and is cheered loudly by the Centre Court crowd. Things are starting to get a bit more lively in the audience as we approach what could be an exciting climax.
Karolina Muchova looks to dampen the Gauff enthusiasm with a superb cross court serve, then bangs an ace down the centre line!
Some superb tennis on display, as you would expect.
Image source, Reuters*Muchova 6-2 1-6 3-3 Gauff
Tracy Austin
Two-time Grand Slam champion on BBC One
This is where you have got to find as many backhands as possible if you are Coco Gauff and do the damage with it.
*Muchova 6-2 1-6 3-3 Gauff
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live
Coco Gauff has weathered the storm.
Karolina Muchova has been the better player in the set but she has found herself at 3-3.
It's that champion mentality again.
Image source, Getty Images*Muchova 6-2 1-6 3-3 Gauff
Coco Gauff clenches her fist as the net-cord helps her out, bouncing a Karolina Muchova forehand into the tramlines. The Czech could have moved 0-30 ahead there.
Muchova is starting to look a little frustrated for the first time - we are approaching the endgame, where every point truly counts. She runs the full gamut of emotions with a pumping fist following a lovely stretching volley at the net.
But Gauff finds her serve when it counts and holds. This is getting tense.
Why are there so many empty seats at Wimbledon this year
Tony, Plymouth
One main reason is that spectators are only allowed to either leave or return to their seats for any reason when players change ends every two games.
This can lead to people being stuck for some time waiting to be allowed to re-enter the court.
We're also experiencing a heatwave. Some spectators therefore take spells away from their seats in order to seek shelter from the heat in shaded areas.
Muchova 6-2 1-6 3-2 Gauff*
Anne Keothavong
Former British number one on BBC One
You just don't expect her to miss those kinds of volleys. Muchova generally has a tidy net game, she has good hands.
Muchova 6-2 1-6 3-2 Gauff*
Karolina Muchova missed a simple volley to hand that previous game to Coco Gauff, she put her fingers to her forehead in annoyance. She will have to put missing such a regulation shot out of her mind quickly.
And she does, with another service hold to 15.
While Muchova is completing her holds quickly, every Gauff service game is a battle at the moment.
Image source, ReutersHeart of a champ, Coco Gauff. Let’s go!
Nashreen, Crete
*Muchova 6-2 1-6 2-2 Gauff
In 2019, Coco Gauff beat Venus Williams as a 15-year-old on her Wimbledon debut. That is still her biggest win at the Championships - but this would surely surpass that.
However she will have to work for it. A splendid cross-court winner from Muchova beats Gauff all ends up, the trajectory of the ball there was unreturnable.
After splaying one long, Gauff has suddenly given up two break points to Muchova. She saves the first as Muchova slips while trying to play a passing shot, and the second with an unreturnable serve.
No guff from Gauff, she manages to hold.
Muchova 6-2 1-6 2-1 Gauff*
Annabel Croft
Former British number one on BBC Radio 5 Live
I just think that Coco Gauff is playing the highest level I have seen from her in the tournament.
When it gets to the closing stages, I feel she will hold her nerve more than Karolina Muchova.
I'll be amazed if it isn't Gauff that ends up on top but there are a lot of points to play for before we find out.
Image source, Getty ImagesI thought dress code for Wimbledon was 100% white clothing and yet many women seem to wear coloured underwear? Why is this allowed?
Sally, Ringwood
Since 2023, female players at Wimbledon have been allowed to wear dark-coloured undershorts after the All England Club relaxed its all-white clothing rule to relieve a "potential source of anxiety" for players on their period.
Women and girls can now wear mid- or dark-coloured undershorts, provided they are no longer than their skirt.
Discussions took place with the WTA, clothing manufacturers and medical teams after players voiced concerns.
Muchova 6-2 1-6 2-1 Gauff*
Karolina Muchova does not look too bothered by her missed opportunities, as she executes a regulation hold to 15.
She's looking to put all the emphasis on Gauff, who she knows is prone to an error or two.
*Muchova 6-2 1-6 1-1 Gauff
Tracy Austin
Two-time Grand Slam champion on BBC One
That was a couple of drop shots that were two high from Gauff. Muchova needed to do more with the first and less with the second, weight for the ball to drop a little.
Two big opportunities missed for Muchova there.
Image source, EPA*Muchova 6-2 1-6 1-1 Gauff
Marion Bartoli
Former Wimbledon champion on BBC Radio 5 Live
It will be fascinating if both players can play at their top potential at the same time.