Harri Heliovaara attempts to whip a forehand down the line but it doesn't have enough bend on it and lands out.

An emphatic overhead smash from Lloyd Glasspool ensures a double hold and keeps the British pair in control.

Sonia Oxley
BBC Sport at Wimbledon

There was a flurry of excitement just now under one of the footbridges that join Centre Court to the players' area as the Queen walked across, followed moments later by Novak Djokovic.

She waved at fans as she walked across towards Centre Court before seven-time champion Djokovic was cheered across.

Will he be getting a royal pre-match pep talk?

A double fault from Harri Heliovaara hands over the first mini-break of this match-deciding tie-break.

Iga Swiatek and Liudmila Samsonova both walk onto Court One wearing massive headphones as they gear up for their Wimbledon quarter-final.

Swiatek may be a five-time Grand Slam winner, but the former world number one has only ever reached this stage of Wimbledon once before.

Grass has not been a favourite surface for the so-called 'Queen of Clay', but it has been a different story so far this year and, after making it to the final of Bad Homburg last month, Swiatek has carried that momentum into Wimbledon.

The eighth seed had to come from a set down in her second-round match with Caty McNally, but it has been reasonably smooth sailing otherwise.

It is also uncharted territory for her quarter-final opponent Samsonova.

Having reached this stage at SW19 for the first time in her career, the 19th seed will have a tough task on her hands having lost on all four occasions she has previously faced Swiatek.

We stay on serve in the early stages of the tie-break.

Julian Cash with a smash volley at the net to edge in front.

So much resilience on show from Julian Cash and Lloyd Glasspool to save three match points.

Henry Patten gets his feet mixed up and hands over advantage.

Cash gets the hold.

This match will be decided by a tie-break.

Hello.

Harri Heliovaara comes up with a stunning cross-court backhand return for 0-30.

And then Lloyd Glasspool can't get Henry Patten's forehand back over. 0-40.

Image source, Getty Images

We'll be keeping across the conclusion of that doubles match of course, but we are really in the business end of the Championships now in terms of the singles' draws and Wednesday will see the semi-final line-up take shape.

Here's a look at what's to come today:

Centre Court (from 13:30 BST)

• Mirra Andreeva (7) v Belinda Bencic
• Flavio Cobolli (22) v Novak Djokovic (6)

Court One (from 13:00 BST)

• Iga Swiatek (8) v Liudmila Samsonova (19)
• Jannik Sinner (1) v Ben Shelton (10)

Harri Heliovaara gets the hold to guarantee at least a tie-break.

Pressure on Julian Cash who will serve to stay in the match.

British second seed Hannah Klugman has taken the first set 6-4 against Spanish 13th seed Charo Esquiva Banuls on court 12, with a quarter-final spot on offer to the victor.

Fellow Briton Mimi Xu is already through to the last eight, thanks to a 6-3 6-3 win over Australian Tahlia Kokkinis on court 18.

Ruby Cooling is next on that court against third seed Lilli Tagger of Austria, and will play Xu next if she wins.

Some nerves here from Lloyd Glasspool?

A first double fault of the match takes the game to 30-30.

Glasspool comes up good on the next point to force Henry Patten wide and the return is out. An ace seals the hold.

This has tie-break written...

Henry Patten is going through the gears on serve.

The Briton gets a hold to 15 and puts some serious scoreboard pressure on Lloyd Glasspool and Julian Cash.

Glasspool will serve to stay in the match.

Image source, PA Media

British duo Alfie Hewett and Gordon Reid are safely through to the semi-finals of the men's wheelchair doubles event at Wimbledon.

The defending champions and number one seeds were straight-set winners over Japan's Takuya Miki and American Casey Ratzlaff on court three.

Meanwhile, in the quad wheelchair singles on court 14, Greg Slade won the first set of his quarter-final against Francisco Cayulef on a tie-break, but Cayulef is serving now for the second at 5-3 up.

Now British pair Lloyd Glasspool and Julian Cash have a bit of defending to do at deuce.

Cash gets the hold to keep us on serve.

This is getting tense.

We had to wait until the ninth game in the opening set and the 10th game in the second set for either pair to come up with a decisive break.

If we get one in this deciding set then it feels like it's going to come late again... I don't have a good track record making predictions, though!

As I finish typing that, Julian Cash and Lloyd Glasspool get to deuce from 40-0.

Phew, blushes spared. Harri Heliovaara slams down the middle to win the point of the match for the hold.

Henry Patten has looked so good at the net throughout this quarter-final. The Briton meets a cross-court effort from Lloyd Glasspool and manages to suck all the pace off the ball and get it to drop for a winner to hold.

The defending champions edge back in front but we stay on serve.

Here were the headlines from and action-packed day nine at SW19:

• Defending champion Carlos Alcaraz produced his best performance of the tournament so far to beat Cameron Norrie in straight sets and book his place in the semi-finals. Norrie's defeat means there are no British players remaining in the men's or women's singles.
• American fifth seed Taylor Fritz will be the Spaniard's semi-final opponent, having defeated Karen Khachanov in four sets earlier.
• World number one Aryna Sabalenka was severely tested by Germany's Laura Siegemund but came from a set down to secure her semi-final spot in the women's singles.
• Sabalenka will face Amanda Anisimova next - the American 13th seed defeated Anastasia Pavlyuchenkova in straight sets to reach her first Wimbledon semi-final.
• British duo Alfie Hewett and Gordon Reid made winning starts in the men's wheelchair singles, although Reid needed a tie-break in the deciding set to get past Belgium's Joachim Gerard.
• Britain's Joe Salisbury is into the mixed doubles final alongside Brazilian partner Luisa Stefani.

We've been consumed with this men's doubles quarter-final this morning and into the early afternoon, but we're edging closer to some singles action.

Five-time Grand Slam champion Iga Swiatek and 19th seed Liudmila Samsonova kick things off on Court One at 13:00 BST.

Henry Patten gets a hold to love to set the defending champions on their way in the deciding set.

Patten comes up with a winner on Lloyd Glasspool's serve to lead 0-15 but that's as good as it gets.

Harri Heliovaara, follows in the footsteps of partner Patten, with a hold to love to edge back in front at the change of ends.

Right, we're back. Or more importantly Julian Cash is back after that off-court medical time out.

One break in each of the opening two sets has been enough to get the job done.

Where do we go now?