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The last meeting between these two was also on grass in the UK. Barbora Krejcikova was the top seed at the Birmingham Classic and met second seed Jelena Ostapenko in the final.

It was the Latvian who got the better of the Czech on that day, winning 7-6 (10-8) 6-4.

That was Ostapenko's fifth win over Krejcikova. They have met seven times and one of Krejcikova's two victories came at the 2022 Australian Open, their only meeting at a Grand Slam until today.

Jelena Ostapenko and Barbora Krejcikova are out onto the grass of Court One.

Ostapenko has won the toss and chosen to serve.

Tracy Austin
Two-time Grand Slam champion on BBC TV

What hit me was when Alex de Minaur said it will be three to six weeks [out injured] but if he moves in the wrong direction it could be four months.

He has done such a great job of becoming more aggressive, more assertive, we always knew that he moved extremely well, one of his best assets. But now he has broken into the top 10, won a grass court tournament coming in here.

His first quarter-final at Wimbledon and you want to get out on the Centre Court so he's absolutely devastated but he's made the right decision.

I think he knew right away that something was wrong.

For Novak [Djokovic] at 37 and he had the knee surgery in early June so probably not the worst thing for him although he played [Holger] Rune on Monday so he will have three days off.

He'll have to find somebody to play some sets with because three days off is an awful lot of time not to play in the middle of a Grand Slam.

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Jelena Ostapenko was the first unseeded player since 1993 to win the French Open when she won her first and only Grand Slam singles title in 2017 as a 20-year-old.

Barbora Krejcikova pulled off the same feat in 2021 whilst also winning the women's doubles title at the same event. Both players have failed to build upon that singles success since though.

Ostapenko has only reached one more Grand Slam semi-final since her French Open win, and it came here at SW19 in 2018.

Krejcikova, 28, has continued to amass the Grand Slam doubles titles, now with 10 winners medals in her cabinet across women's and mixed doubles, but hasn't made it past another quarter-final since her 2021 triumph.

Can either win their second singles major at this year's Championships?

Image source, Getty Images

The Court One roof is open and the players are due on shortly so let's build up to the first singles quarter-final of the day...

Following Alfie Hewett's victory earlier another Briton, Gordon Reid, is in action on court 14 in the men's wheelchair singles.

He's up against third seed Gustavo Fernandez of Argentina and made a strong start, breaking at the first time of asking to go 2-0 up in the first set.

However, Fernandez hit back immediately and it is currently back on serve at 2-2.

Joe Rindl
BBC Sport at Wimbledon

Image source, Getty Images

Yesterday I had a chat with Jamie Murray's former partner Bruno Soares.

Brother Andy Murray may be playing his last ever Wimbledon, but Jamie, 38, still has at least "a couple of years left" the Brazilian told me.

"Tennis-wise and physical-wise he’s still looking very good," said Soares.

"But we get to a point, I mean it happened to me, sometimes just the motivation it becomes tougher and tougher just to train every single day."

Soares also told me he had a phone call with Jamie last week who remains "super pumped about playing."

"I hope he still plays a couple of years. I retired when I was 40 so he’s got a couple of years left."

Pat Cash
Former Wimbledon champion on BBC TV

It's hugely disappointing for Alex de Minaur who has really got himself into the position where he feels he can compete at the Grand Slam tournaments and he has a shot at winning, getting to the semi-finals/finals.

Obviously he is playing Novak Djokovic but there is a question about Djokovic's fitness, so you think this is possibly the best opportunity Alex would have to go further. Novak is playing really well and getting better all the time, we know.

You could see how devastated he was and he has made the right decision. It's bad luck for him, bad luck for Centre Court and bad luck for the crowd but really good news for Novak Djokovic.

Who are you supporting or predicting to win in today's quarter-finals? Here are the ways you can share your thoughts with us and feature on this feed...

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Without even stepping on court today, Novak Djokovic has matched Roger Federer's record of reaching 13 Wimbledon men's semi-finals in the Open Era.

The Serb also becomes just the third player over the age of 37 to make it through to a men's singles semi-final at a Grand Slam after Ken Rosewall and Federer.

Image source, Getty Images

With no men's quarter-final scheduled for Centre Court now today, British mixed doubles pair Joe Salisbury and Heather Watson have had their match moved to the famous court.

The Brits will face seventh seeds Jan Zielinski of Poland and Taiwan's Su-Wei Hsieh following Elena Rybakina and Elina Svitolina's quarter-final in the women's singles.

Joe Rindl
BBC Sport at Wimbledon

It's not looking good for Briton Henry Patten in his doubles match with Finnish partner Harri Heliovaara.

The pair have lost the first set to Honduran-Croatian duo Marcelo Arevalo and Mate Pavic in their quarter-final over on court 12.

That won't be a surprise to six-time Grand Slam doubles winner Bruno Soares who has tipped fourth seeds Arevalo and Pavic as his favourites for the men's doubles title.

The Brazilian told me at a Wimbledon legends event yesterday the pair are "on a very hot streak" and have been "playing extremely well" since they won the French Open six weeks ago.

Soares did also add the draw is far more open than usual, even with Arevalo and Pavic dominating, and "it’s nice to see there’s a lot of movement and new teams coming in."

Of course, that means that Novak Djokovic is through to the semi-finals and can sit back, relax and wait to find out who he will play in the last four.

Lorenzo Musetti and Taylor Fritz will compete to face the second seed in the second match on Court One this afternoon.

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Disappointing news to bring you as Alex de Minaur has confirmed that he has had to withdraw from his quarter-final match against Novak Djokovic because of a hip injury.

A statement from the Australian ninth seed read: "Obviously not an announcement I wanted to make by any means. I am devastated to pull out due to a hip injury, a little tear of the fibre cartilage that kind of is at the end of or connects to the adductor.

"I felt a loud crack during the last three points of my match against Fils and got a scan yesterday and it confirmed that this was the injury and with high risk of making it worse if I was to step on court."

John McEnroe praised Novak Djokovic for criticising the Wimbledon crowd, saying the Serb had been disrespected in his career at least 100 times.

The tennis legend said Djokovic's ability to deal with the "worst heat" is why he has become the greatest player of all time.

Djokovic spoke out against fans after his Wimbledon fourth-round win, claiming they used the bellowing of his opponent Holger Rune's surname as "an excuse to boo".

The 24-time Grand Slam champion insisted the noise - fans elongating the first vowel in Rune's surname - was designed to wind him up.

McEnroe, who won seven singles majors, agreed with the 37-year-old Serb.

Asked by presenter Clare Balding on BBC TV about what he would say to Djokovic, the 65-year-old American said it would be: "Well done."

McEnroe added: "Don't you think there's been at least 100 matches over the course of the last 10-15 years that Djokovic has been disrespected because of how good he is?"

Read more here.

All singles matches are quarter-finals.

Centre Court (from 13:30 BST)

• Elena Rybakina (Kaz, 4) v Elina Svitolina (Ukr, 21)
• Alex de Minaur (Aus, 9) v Novak Djokovic (Srb, 2)

Court One (from 13:00 BST)

• Jelena Ostapenko (Lat, 13) v Barbora Krejcikova (Cze, 31)
• Lorenzo Musetti (Ita, 25) v Taylor Fritz (USA, 13)

Michael Emons
BBC Sport at Wimbledon

Image source, Michael Emons

The men's and women's wheelchair singles were meant to start yesterday with the best matches on court three but the rain had other ideas so they have all been rescheduled and court 14 is now where to go to watch the action.

With the tournament playing catch-up this court began at 10:30, instead of the usual 11:00, to ease the backlog.

To start off was an all-British tie between 18-year-old Wimbledon debutant Ben Bartram and two-time finalist and second seed Alfie Hewett, who has been the runner-up in this event in both the past two years.

Bartram made a dream start by breaking the Hewett serve in the first game of the match, but Hewett fought back to win all six of the remaining games in the opening set.

He then broke the Bartram serve immediately in set two, before gaining a double break in the fifth game as Bartram’s sliced backhand drifted wide. A fine cross-court winner gave Bartram one of the breaks back, before the pair exchanged breaks before Hewett served out the win with an ace.

After this match comes Britain's Gordon Reid taking on Argentina's Gustavo Fernandez, the third seed.

Then it's the women's turn with reigning champion and top seed Diede de Groot, aiming for a sixth Wimbledon singles title, playing Momoko Ohtani of Japan before Britain's Lucy Shuker faces Kgothatso Montjane of South Africa.

If the weather allows, the quad wheelchair singles quarter-finals will take place too, with Britain's Andy Lapthorne up against American David Wagner.

Image source, Michael Emons

Image source, Michael Emons

Hello and welcome along to BBC Sport's coverage of day 10 at Wimbledon. We will have all the coverage on BBC TV, BBC Red Button and BBC Radio 5 Live throughout the day.

You can follow all the coverage in this very page.

It's another day of big quarter-final clashes on the show courts at Wimbledon today.

Elena Rybakina is first up on Centre Court today and, with so many seeds having fallen by the wayside, the 2022 champion is now the clear favourite.

She's up against Ukraine's 21st seed Elina Svitolina.

Image source, Getty Images

That is followed by Novak Djokovic's first appearance at the All England Club since he accused the Wimbledon crowd of disrespecting him following his victory over Holger Rune in round four.

He takes on ninth seed Alex de Minaur of Australia. How will the fans on Centre react to 24-time Grand Slam champion today?

Those comments did somewhat overshadow what was a fine performance from the seven-time Wimbledon champion...

Meanwhile on Court One, Latvia's Jelena Ostapenko faces Barbora Krejcikova of the Czech Republic before Italy's Lorenzo Musetti takes on American 13th seed Taylor Fritz.

Yep, we've got a fascinating day ahead.

Image source, Getty Images