Image source, EPA

Czechs Barbora Krejcikova and Katerina Siniakova had been a tightknit women's doubles pairing since they were teenagers. Together, they won seven Grand Slam titles and Olympic gold in Tokyo. Despite that success, the former world numbers ones announced they would be parting ways at the start of this year.

They've won the last two titles at Melbourne Park but today on Margaret Court Arena, they were on opposite sides of the net with their new partners in the quarter-finals. It was third seeds Siniakova and Australian Storm Hunter who prevailed, coming from a set down to beat fifth seeds Krejcikova and Germany's Laura Siegemund 4-6 7-5 6-4.

On 1573 Arena, second seeds Su-Wei Hsieh of Chinese Taipei and Elise Mertens of Belgium won 6-4 6-2 against ninth seeds Brazil's Luisa Stefani and Dutchwoman Demi Schuurs.

It means the women's and men's doubles semi-final line-ups are now set, with the men set to play their final-four matches on Rod Laver Arena on Thursday and the women taking centre stage on Friday.

A well-taken volley at the net by Krawczyk makes it 0-30 before a double fault by Polmans hands over three set points.

Polmans misses the baseline on the first and that's the opening set for Skupski and Krawczyk, who recover from 4-2 down to take it.

For the first time since the opening game, Skupski and Krawczyk hit the front in the opening set with another comfortable Skupski service game.

From facing pressure to applying it. Skupski and Krawczyk earn their first break point - and Skupski steps in to send a backhand volley into open court to clinch it!

Krawczyk is facing more pressure on her serve.

Having been broken in her opening service game the American is relieved to see Polmans sends a forehand long on a break point, before seeing out the game.

BBC Radio 5 Sports Extra

Head to the top of the page to listen to live coverage of the day 11 action at the Australian Open with Tennis Breakfast on Radio 5 Sports Extra.

You can also tune in on the BBC Sounds app!

But there's still no way through for Skupski and Krawczyk.

Polmans holds serve after losing the first point and the Australian duo are edging closer to the first set.

Another love hold for Neal Skupski in this first set. The Briton has been solid on serve so far.

Image source, Getty Images

At the age of 43, India's Rohan Bopanna will become the oldest ever world number one in men's doubles after the Australian Open is complete.

It will be Bopanna's first time at the top spot, which was guaranteed after his quarterfinal win with Australia's Matthew Ebden. The second seeds won 6-4 7-6 (7-5) against Argentinian team Andres Molteni and Maximo Gonzalez, who were the sixth seeds.

In today's other last eight matches, the seventh and eighth seeds were both knocked out by unseeded opposition.

On Margaret Court Arena, seventh seeds Monaco's Hugo Nys and Poland's Jan Zielinski were knocked out by German duo Yannick Hanfmann and Dominik Koepfer.

Fellow Germans Kevin Krawietz and Tim Puetz, the eighth seeds, lost 7-5 6-4 to Italians Simone Bolleli and Andrea Vavassori on 1573 Arena.

Super serving by Olivia Gadecki ensures she and Marc Polmans hold serve to love to back up that break.

The Australian wildcards have the upper hand on the second seeds.

An early setback for Neal Skupski and Desirae Krawczyk.

Krawczyk sees her serve broken in the American's opening game and it's Australians Marc Polmans and Olivia Gadecki who have the breakthrough.

Britain's Neal Skupski and American team-mate Desirae Krawczyk are up and running on Margaret Court Arena.

Skupski secures a love hold in his opening game before Marc Polmans holds after the Australian wildcard pairing are taken to deuce.

MIchelle: Daniil Medvedev is the Best on and off the court, ever! What a great win. Very very intelligent guy!

While we await the start of the night session on Rod Laver Arena, with Chinese 12th seed Zheng Qinwen facing Russia's Anna Kalinskaya from 08:15 GMT, we'll follow the progress of Britain's Neal Skupski who will shortly be in mixed doubles action alongside American team-mate Desirae Krawczyk.

The second seeds are taking on Australian wildcards Olivia Gadecki and Marc Polmans in the semi-finals.

Image source, Getty Images

This Polish fan dressed as a king has been at Melbourne Park throughout the tournament supporting all the Polish players.

His last compatriot has fallen today but it was a positive result for Hubert Hurkacz who walks away with his best ever result at the Australian Open.

Image source, Reuters

What do you make of how the Australian Open semi-finals are shaping up, and how do you expect our remaining quarter-finals to go?

Wherever you following the action from this morning, and whatever you want to say about all things Aussie Open, get in touch with us via #bbctennis on X (formerly Twitter), text 81111 (standard rates apply) or send us a WhatsApp message on 03301231826.

Remember to leave your name and where you're from so we can feature you on the feed!

It was hard work for Daniil Medvedev on Rod Laver Arena, but the third seed came through in five sets after being taken the distance by Hubert Hurkacz.

Time to get resting.

Image source, Getty Images

Image source, Getty Images

We've still got two more quarter-finals to come today!

In the night session on Rod Laver Arena, from 08:15 GMT, Chinese 12th seed Zheng Qinwen and Russia's Anna Kalinskaya will meet as they attempt to set up a semi-final against Ukraine's Dayana Yastremska, who earlier beat Czech teenager Linda Noskova 6-3 6-4.

Then, Spanish second seed Carlos Alcaraz takes on German Alexander Zverev, with Daniil Medvedev awaiting the winner after overcoming Hubert Hurkacz 7-6 (7-4) 2-6 6-3 5-7 6-4 a short while ago.

Image source, Getty Images

Here's what Daniil Medvedev had to say following his quarter-final victory over Hubert Hurkacz:

"I feel a bit destroyed right now. He played good, I won't be tough on myself. I just had to try and do whatever I could. If I lose, I lose, it's OK. I really liked the match point."

On deciding how far back he would stand when receiving: "It was funny. After the press conference they were asking me about the return. I knew against Hubert, amazing at serve and volley, the ball continues to go up even if I stay back so it doesn't make sense to go there. I knew that I would go closer I just didn't want to tell anyone.

"Every time I play it is tough both for me and my opponent. I'm happy to make my opponents run and happy to run myself."

On saving a break point in the fifth set: "Sometimes the way Hubert plays, to give himself time, he puts the ball up a bit. I was so tired, playing against the wind, I didn't feel I had enough to win a point so I serve and volleyed."

On the schedule he has had: "It's all fine. Four in the morning is a tough situation. They played matches at 12, there were four-hour matches, it was almost like it was on purpose from the tennis players. I love this tournament and to be here, thanks for the support."

The crowd show their appreciation to Hubert Hurkacz, who gave everything in an entertaining quarter-final.

Daniil Medvedev celebrates with the crowd and grimaces as he takes his seat. That took a lot.

Image source, Getty Images