Karolina Muchova has the early mini-break but Naomi Osaka is in quickly to reach a drop shot and ensure things don't get any worse for her.

Chris Bradnam
Commentator on BBC One

Well done, Jiri Lehecka!

He will take on his first tie-break of the tournament. By comparison, Alexander Zverev has played five tie-breaks in this tournament and he has won four of them.

Naomi Osaka must feel like she's having to win these points two or three times over, such is the defence of Karolina Muchova.

She manages it, though, rifling a forehand winner down the line to hold.

To a tie-break we go.

An emphatic ace seals Jiri Lehecka's turnaround in that service game.

And we have a tie-break. Lehecka must win it to stay in the match but Alexander Zverev begins the breaker with a wonderful volleyed winner.

Todd Woodbridge
Former Wimbledon doubles champion on BBC One

When you play Alexander Zverev on this surface, you don't try to play through him because he likes to go deep. It is very hard to hit a ball past him, so you have to build your pressure by your approach.

We have seen Jiri Lehecka use the forehand down the line well with a measured shot. He has to hit that and come in, not try to hit the winner off that ball.

Once they are in the points though, Lehecka is looking the better player. He just hasn't been able to make enough decent returns to put pressure on Zverev's service games in this set.

Harry Poole
BBC Sport at Wimbledon

There was a quick apology from Karolina Muchova after that fortuitous net cord, before she swivelled to return to her baseline and puffed out her cheeks in relief as she looked up to the sky.

A big slice of luck in that game, which will frustrate Naomi Osaka even more as Muchova wriggles free again.

No time to dwell on that here though.

Finally, Alexander Zverev is able to make an impact against serve. Aggressive returning and hitting in rallies forces two Lehecka errors.

15-30... the German is two points from the quarter-final.

Oh but goodness what tennis from Lehecka, superb defensive play and then a point-winning delicate, delicious drop shot for 30-30.

Image source, Getty Images

Karolina Muchova survives.

A serve and volley gets her to advantage before Naomi Osaka is unable to return a big serve out wide.

Muchova has guaranteed at least a tie-break in this first set.

My prediction of a tie-break was looking ropey as Naomi Osaka went up 0-30 but Karolina Muchova battles back.

The Czech needs a bit of luck as she races in for a volley, gets it wrong but the ball hits the net cord and drops on Osaka's side of the net.

An apology follows but we all know she's not that sorry. No player is.

Osaka shrugs that off, though, and a double-fault hands her a break point. One that is snatched away by Muchova's booming forehand winner.

We're back at deuce. That prediction is still in the balance.

Alexander Zverev replies with a hold to love of his own.

Both players struggling to get any sort of consistent purchase on their returns - and that is a testament to the accuracy and quality of serving on show.

Again, Jiri Lehecka must serve to stay in the tournament.

For the third match in a row, Briton Henry Patten and Finnish partner Harri Heliovaara have come through a final-set tie-break to win!

They've beaten Guido Andreozzi and Manuel Guinard 2-6 6-4 7-6 (10-6) to reach the men's doubles semi-finals.

The 2024 Wimbledon champions will face Thanasi Kokkinakis and Aleksandar Kovacevic, who won their quarter-final in straight sets, as they bid to reach a fourth Grand Slam final as a duo.

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Jiri Lehecka shows no sign of pressure of needing to serve to stay in the match.

Two superb serves set him up for a 30-0 lead. Another gives him the chance to unleash a forehand winner for 40-0.

Alexander Zverev gambles with a forehand close to the side line - but it's out. Another Lehecka hold to love - his serve has been amazing today.

Harry Poole
BBC Sport at Wimbledon

Naomi Osaka really got herself fired up with that booming backhand which almost took the racquet out of Karolina Muchova’s hands in the Czech’s previous game.

But she slammed the ball into the net in frustration after missing the line at 15-15, as her opponent escaped.

Both players are striking the ball beautifully and it’s a really high-quality contest.

It's Naomi Osaka's turn for a comfortable service game - it's all very different to the start of this set.

A second-serve ace finishes it off.

I fancy we're heading for a tie-break. Bold prediction I know...

A comfortable hold for Alexander Zverev to move 5-4 up, so Jiri Lehecka will serve to stay in the match after the changeover.

Wonderful low backhand creeps just over the net from Jiri Lehecka to begin his latest service game.

A couple of Zverev errors and a Lehecka ace later, and it's another hold to love for the Czech 13th seed.

This fourth set seems to have tie-break written all over it...

Todd Woodbridge
Former Wimbledon doubles champion on BBC One

Alexander Zverev's level isn't currently anywhere near what he showed yesterday.

His serving has dipped but so has his forehand. They aren't anywhere near as dynamic or strong as he usually hits them. He is usually so confident on that forehand wing, but his forehand quality dipped from 9.3 and 9.2 in the first and second sets to 5.9 in the third set in the latter stages of yesterday.

Taking a look at today, it is down at 3.5. He has missed half of his forehands in this set, so he is doing well to hang in here.

Image source, Getty Images

Annabel Croft
Former British number one on BBC Radio 5 Live

Muchova is very calm, there's no stress in her face whatsoever.

"Come on!" shouts Naomi Osaka after drilling a backhand that Karolina Muchova can't get back to make it 0-15.

That's as good as it gets for the Japanese 14th seed in this game, though.

Muchova is striking the ball just as well as Osaka, with perhaps marginally less power, and holds to 15.

Image source, Getty Images