If you're just joining us, here's what you might have missed on this middle Sunday of Wimbledon 2023:

• Jessica Pegula is through to the last eight of the women's singles after a comfortable straight-set win on Court One over Lesia Tsurenko, while 16-year-old Mirra Andreeva is into the last 16.
• Roman Safiullin is the first man through to the men's quarter-finals, the world number 92 beating Denis Shapovalov in four sets.
• Jamie Murray was victorious in the men's doubles earlier and is a set up alongside Taylor Townsend in his mixed doubles match, but Lloyd Glasspool and Liam Broady were among the British players to suffer doubles losses today.

More details of the British players who have been in action shortly... head to the BBC Tennis page for match reports, analysis and video highlights.

It's been over half an hour since Andrey Rublev had match points. It doesn't seem to be playing on his mind as he holds again without much fuss.

Alexander Bublik hits a few returns long which makes Rublev's life a little easier.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

Keep in mind that Bublik has not broken serve once, so you think if he is to win it will be in a fifth set tie-break.

No drama to report on the Alexander Bublik service game. The 23rd seed holds to keep the scoreboard ticking.

Image source, Getty Images

Image source, Getty Images

Surely Jannik Sinner will take yet more chances to break Daniel Galan's serve this time? Can you believe the world number eight is 0-14 on his break point chances?

An hour and fifty minutes on, the Italian finally converts on his 15th attempt.

Galan has been looking fatigued - will this take all the energy out of the Colombian's legs?

Alexander Bublik's serve has been key to his comeback but Andrey Rublev has been close behind.

The seventh seed's serve has also been a big part of his success today and Bublik can't get a decent return in play.

At 40-30, Andrey Rublev runs to his right and plays a trademark forehand down the line accompanied with his grunt, sounding like a boxer hitting a punching bag in the gym.

The forehand looks like it might land on the line, but ultimately falls just wide and Alexander Bublik holds his serve.

Jess Anderson
BBC Sport at Wimbledon

Being sat on the smaller courts like court 12 and 18 where you’re right in the heart of the action really makes you appreciate the hard work of the ball kids.

It’s a well-oiled machine to keep supplying the players with balls and running them up and down the lines.

But how cool? In fact, I would very much like to have a go.

That should definitely be a thing - have a go at being a ball kid. Well, ball grown-up I suppose.

Image source, PA Media

Nothing to see here folks. Andrey Rublev holds after Alexander Bublik's slice return drifts slightly wide of the line and he levels in this fifth set.

Image source, PA Media

As you were on Court One.

Galan frames a forehand to bring Sinner to 15-30, but the Colombian does superbly to reach down and pick up a volley as he once again gets free and holds on to his second set advantage. Excellent recovery.

But Sinner stays close by with a straightforward game, ready to ask further questions of his opponent.

30-30 on Andrey Rublev's serve.

Alexander Bublik cries 'come on!' after winning a point at the net.

For the first time in this match, Alexander Bublik is ahead.

He serves first in this fifth set and manages to hold, giving the 23rd seed the lead.

Who will make it into the quarter-finals for the first time at Wimbledon?

Andrey Rublev looked to have this match sewn up at two sets up and playing solid tennis.

Alexander Bublik has clung on though and raised his level, getting the better of the seventh seed in crucial moments in two tiebreaks.

Settle in for a fifth, ladies and gentlemen, this could get exciting...

Michael Emons
BBC Sport at Wimbledon

Alexander Bublik bounces high in the air, screams in the direction of his team and, somehow, has taken this into a fifth and deciding set.

If Rublev doesn't win this, it will be one of the most painful losses of his career.

He was two points away at 6-6 in the third set tie-break, failed to take two match points before the fourth set tie-break, then led 5-3 in the second breaker only to lose four points in a row and set up a one-set shootout.

Great character shown from Bublik, great entertainment for those on Centre Court.

There is no denying Jannik Sinner is getting more than his fair share of opportunities to get a break back but the Italian lets a 40-0 lead slip away, and Galan holds on to his advantage, even though his levels have dropped significantly.

Sinner would do well to keep an eye on the increasingly weary body language of his opponent.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

Image source, PA Media

Bublik is winning over a lot of fans. If you didn't know him already you are getting to know him now. This guy is a character and he can play.

Andrew Castle
BBC Sport tennis commentator on BBC One

We are going the distance here on Centre Court. This is turning out to be an absolute cracker. No wonder Rublev is upset, he can't get over the line.

Alexander Bublik jumps in celebration and yells 'Let's go!' to his box as he wins another tie-break!

This fourth-round match is going into a fifth set after the 23rd seed wins another closely-contested tiebreak.

The Kazakh comes back from a mini-break down and then an unreturnable serve helps him win the fourth set.

A rare rally breaks out in this match and Andrey Rublev can't handle a shot from Alexander Bublik in the middle of the court and he shanks a forehand wide.

The next point sees Rublev dive to the grass, ending the point on the ground after he fails to retrieve a Alexander Bublik low volley at the net.

All square in the tiebreak.