A hold! And a comfortable one at that.

After her troubles in her previous service game, Clara Tauson looks far more comfortable.

She gets the serve going and backs it up with some solid groundstrokes to consolidate the break.

Image source, Getty Images

Greg Rusedski
Former British number one on BBC Radio 5 Live and BBC Sounds

Jannik Sinner is just starting to settle here, don't discount the world number one yet.

He doesn't have any panic in him. He has an interesting background because he was originally a downhill skier, so he says tennis is easy because you always get a second chance. His mindset is impeccable.

I think he is the mentally-toughest player out there on tour at the moment.

Image source, Getty Images

From 15-15, Jannik Sinner does well to get his racquet on two monstrous Dimitrov serves but cannot return either.

But he's not the world number one for nothing - grinds his way back into the game as a wonderful backhand winner ends a captivating rally of dicing and slicing. Deuce.

The mixed doubles semi-finals await for Britain's Joe Salisbury and his Brazilian partner Luisa Stefani.

They've beaten Jan Zielinski and Su-Wei Hsieh 7-6 (9-7) 6-3 to progress to the final four.

It's not good news for GB's Neal Skupski and American Desirae Krawczyk though. The two-time Wimbledon champions are out of this year's tournament after a 7-5 7-6 (9-7) defeat by the second seeds Zhang Shuai and Marcelo Arevalo.

Three straight breaks to start this match.

All very odd. It's Clara Tauson turn to show her power this time but, at the change of ends, she's still not happy about the conditions.

Iga Swiatek double faults twice more. She needs to get that under control but first, she's got to try and get back on serve again.

Tim Henman
Former British number one on BBC TV

Sinner normally makes it look so easy and picks up his rhythm from the word go. These first few games have not been easy for him.

Great acceleration from Dimitrov getting his forehand into play.

Image source, Getty Images

Greg Rusedski
Former British number one on BBC Radio 5 Live and BBC Sounds

A perfect start for Grigor Dimitrov. Jannik Sinner is going into the backhand side a little bit too much.

Let's be honest, both men have had good draws to get to this fourth round. There hasn't really been a natural grass-courter in any of their three previous matches.

Here's a stat for you. Remember that Jannik Sinner has equalled a 53-year-old record in only dropping 17 games at this stage of the tournament? (see 18:49)

Well, of the seven men to drop the fewest games - between 27 and 32 - before the quarter-final stage (Djokovic, Federer and Murray among them), NONE of them have gone on to win the tournament those years.

There's a thing called peaking too early...

Anyway, Jannik Sinner puts a backhand winner away to get himself on the board and put such thoughts to the back of his mind.

Naomi Broady
British player on BBC Radio 5 Live and BBC Sounds

I think this match-up is a fascinating one in terms of the game styles.

Iga Swiatek is obviously the player who is really experienced. If you are going to beat Swiatek, particularly on grass, it is the big striking power games that seem to get the job done, and Clara Tauson has plenty of that.

Back on serve - that didn't take long.

Clara Tauson's advantage lasts all of one game as Iga Swiatek shows what she can do.

The eighth seed attacks the second serve and, from there, takes over with some powerful groundstrokes.

Tauson complains about the fact she's slipping on the grass but I'm not sure what the umpire is meant to do about that.

Image source, Getty Images

Jess Anderson
BBC Sport at Wimbledon

Everybody stay calm! Jannik Sinner has been broken!

For the first time at SW19 this week, Sinner is down a break. Well done Grigor Dimitrov.

This is not the Jannik Sinner of Wimbledon 2025 week one. He's finding the net with the regularity of Harry Kane.

In fairness a lot of the errors are being forced by Grigor Dimitrov's excellent start. A comfortable hold to 15 for the Bulgarian, who has begun brilliantly.

Well, that's one way to start!

Clara Tauson chose to receive and shows exactly why as she breaks Iga Swiatek to love.

A couple of double faults don't help Swiatek but there are also some rasping forehands from Tauson.

An early statement of intent from the Dane.

Greg Rusedski
Former British number one on BBC Radio 5 Live and BBC Sounds

I'm so looking forward to this one.

In that first [service] game, Grigor Dimitrov was really trying to attack the forehand side and going after his first serve. He has already hit a serve at 141mph.

He has to go after it, he has to be brave and bold, and he has to attack Jannik Sinner's forehand side. Although all of this is easier said than done.

Image source, Getty Images

What a start for the veteran!

Jannik Sinner dumps a volley into the net and the world number one's proud record of not being broken this tournament bites the dust just minutes into this last-16 tie.

Image source, Getty Images

Next up on Court One, it's former world number one Iga Swiatek up against 23rd seed Clara Tauson of Denmark.

Swiatek is a five-time Grand Slam champion but has only made it to the quarter-finals at the All England Club once.

Can the Pole double her tally this evening? She's goes in as favourite but Tauson has already beaten former champion Elena Rybakina so will be full of confidence.

Tim Henman
Former British number one on BBC Two

A promising start for Dimitrov. If he can change things up a bit and finish points at the net, that's perhaps where he can gain an advantage.

Sinner has not been broken in the Championship so far. This could be an early breakthrough.

If you're a casual tennis fan, the name Grigor Dimitrov is probably most famous, in this country anyway, for upsetting Andy Murray in the 2014 Wimbledon quarter-finals.

Victory this evening would be an even larger shock - and he's made a decent start, 15-30 up on the Sinner serve.

Oh and a Sinner double fault hands Dimitrov two break points. The Italian has not been broken at all during these Championships...

Jess Anderson
BBC Sport at Wimbledon

Trying to think of something new to say about Jannik Sinner is genuinely quite difficult.

He has been in imperious form at these Championships.

This is, however, the first time he is facing a seeded player at SW19 this year.

Grigor Dimitrov has not had the greatest year when it comes to the majors, having to retire injured in both France and Australia.

The long legs of Jannik Sinner go in opposite directions as he's left grounded trying to reach a Dimitrov forehand out wide.

The 34-year-old is made to work pretty hard for that opening service hold - but hold he does, thanks to a sliding backhand volley winner at the net.