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Next up on Court One is Jannik Sinner against Ben Shelton.

Top seed Sinner will count himself somewhat fortunate to be playing this match today.

The world number one said he could not accept his progress to the Wimbledon quarter-finals "as a win" after Grigor Dimitrov tearfully exited the competition when he was forced to retire injured in their fourth round tie on Monday.

The Bulgarian had been leading 6-3 7-5 2-2 at the time against Sinner, who had also required treatment on an elbow issue from a fall during the same match.

There were doubts about the Italian's fitness for this quarter-final with Ben Shelton when he confirmed he would have a scan on his elbow on Tuesday and later cancelled his practice session.

If Sinner is not in peak physical condition, 10th seed Shelton could take advantage with his big serves and powerful groundstrokes to reach his second Grand Slam semi-final of the year - and a first at SW19.

Mirra Andreeva stands firm to get the hold.

So many of these games are proving so close now.

The pair could only be separated by a tie-break in the first set. Are we going to need another to decide this second?

Great Britain's Andy Lapthorne has forced a deciding set in his men's quad wheelchair quarter-final against Ahmet Kaplan.

The 2019 finalist lost the first set 6-2 but roared back into the match in the second, winning the first four games to race into a 4-0 lead before closing out the set 6-1.

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Belinda Bencic looks a little agitated as she is beaten by a forehand and turns to vent her frustration in the direction of her coaching box.

Mirra Andreeva attempts to close out the hold on the next point but goes long.

Eighth seed Iga Swiatek, speaking on court after beating Liudmila Samsonova to reach her first Wimbledon semi-final: "Honestly, it feels great. I have goosebumps after this win. I am super happy and super proud of myself and I will keep going.

"I really enjoy playing [on grass] this year and hopefully it is going to last as long as possible. I worked hard to progress here on this surface. It is a pleasure to play in front of you guys so thank you for the support."

On how she gets ready for tomorrow's semi-final: "It's a different rhythm to what we usually have on Grand Slams. I have only played twice like that. I will recover today, try not to celebrate too much but already focus on the next one, prepare in the evening and I will be ready tomorrow."

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The atmosphere has been subdued for large parts of this very even quarter-final, but it just edges up a notch with the hint of another break point being offered up when Mirra Andreeva leads 0-30.

But Belinda Bencic comes back strong with an overhead smash getting her to 30-30 before going on to get the hold.

Fantastic recovery.

British duo Joe Salisbury and Neal Skupski have been knocked out in the quarter-finals of the men's doubles event following a straight sets defeat to Marcel Granollers and Horacio Zeballos.

In a repeat of the French Open final, Granollers/Zeballos once again came out on top, winning 6-7 (6-8) 6-7 (3-7) on court three.

Salisbury/Skupski earned the only break point of the match in the ninth game of the second set but couldn't seize their opportunity.

Granollers/Zeballos then took control early in the tie-break and converted the first of their three match points to advance to the last four, where they will face another all-British duo in Julian Cash and Lloyd Glasspool.

British pair Ben Bartram and Dahnon Ward have been knocked out of the men's wheelchair doubles in the quarter-finals.

They lost in straight sets (7-5 6-4) to Zhenxu Ji and Sergei Lysov, who will face second seeds Martin de la Puente and Ruben Spaargaren in the last four.

Jess Anderson
BBC Sport at Wimbledon

The return of the sunshine today has seen a return of the popular week-one accessory - the fan.

Both sides of Centre Court are bathed in sunshine with people desperate to create a bit of a breeze.

A hold to love will ease any concerns for Mirra Andreeva after having to stave off two break points in her previous service game.

Kat Downes
Tennis commentator on BBC Two

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Iga Swiatek is a Wimbledon semi-finalist for the very first time.

The "Queen of Clay" was dethroned in Paris but she conquers new territory on the grass.

Her second Wimbledon quarter-final and the first that ends in victory.

Russell Fuller
Tennis correspondent on BBC Radio 5 Live and BBC Sounds

For the first time in her career Iga Swiatek is into the Wimbledon semi-finals on the surface on which she has always been suspicious.

After a wobble on serve late in the first set when Belinda Bencic had to defend two break points, the Swiss has looked pretty solid again.

Another hold to 15 keeps her ticking over.

Russell Fuller
Tennis correspondent on BBC Radio 5 Live and BBC Sounds

All the pressure is now on Liudmila Samsonova's shoulders, she's never been to a Grand Slam quarter-final before.

Liudmila Samsonva misjudges a drop shot into the net and then Iga Swiatek nails a forehand winner to go 15-30 in front, two points away from the match.

And now the former world number one has two break points as Samsonova sends a backhand wide...

Kat Downes
Tennis commentator on BBC Two

Iga Swiatek is hitting her way out of trouble, cranking up the power and intensity.

Annabel Croft
Former British number one on BBC Radio 5 Live

This is really turning and becoming quite problematic for Iga Swiatek because she definitely had complete control of this match and this set, and things are becoming increasingly difficult.

Iga Swiatek gets a warning for a time violation at the start of her service game and falls 0-30 down, but then puts together four points in a row to ensure she'll definitely have a second-set tie-break to call upon if she can't break serve in this next game.