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NOW: Zheng Qinwen beats Oceane Dodin 6-0 6-3 in women's fourth round
Carlos Alcaraz beats Miomir Kecmanovic 6-4 6-4 6-0 to reach men's quarter-finals
Cameron Norrie beaten by Alexander Zverev 7-5 3-6 6-3 4-6 7-6 (10-3)
Victoria Azarenka loses to Dayana Yastremska; Elina Svitolina retires in first set against Linda Noskova, Daniil Medvedev wins
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BBC Radio 5 Sports Extra
Thanks for being with us this morning and be sure to join us tomorrow as we begin the Australian Open quarter-finals.
Head to the top of the page to listen to live commentary of the fourth round match between Chinese 12th seed Zheng Qinwen and France's Oceane Dodin on Radio 5 Sports Extra.
You can also listen to Tennis Breakfast on BBC Sounds.
Goodbye!
Tomorrow sees two of the women's singles quarter-finals as well as two of the men's singles quarter-finals.
Rod Laver Arena
Not before 02:00 GMT
WS: Marta Kostyuk (Ukr) v Coco Gauff (US, 4)
Not before 03:30 GMT
MS: Novak Djokovic (Srb, 1) v Taylor Fritz (US, 12)
From 08:00 GMT
WS: Barbora Krejcikova (Cze, 9) v Aryna Sabalenka (Blr, 2)
MS: Jannik Sinner (Ita, 4) v Andrey Rublev (Rus, 5)
Also, in the third match on the Kia Arena, there is a mixed doubles quarter-final featuring three British players.
The all-British team of Heather Watson and Joe Salisbury take on the pairing of Britain's Neal Skupski and American Desirae Krawczyk.
We'll be shutting up shop soon but you can read more about today's singles action so far:
It has been a mixed day for the British players involved in the doubles today.
Fifth seeds Neal Skupski with his new Mexican partner Santiago Gonzalez lost 3-6 7-6 (7-1) 6-4 in the men's doubles third round to Ariel Behar and Adam Pavlasek.
Eleventh seeds Lloyd Glasspool with Dutch partner Jean-Julien Rojer also bowed out to Hugo Nys and Jan Zielinski 3-6 6-4 7-6 (10-3).
The mixed doubles saw results for the alternate pairing of Heather Watson and Joe Salisbury, beating Ellen Perez and Rojer 6-3 6-2.
They face Skupski and America's Desirae Krawczyk in the quarter-finals.
Jamie Murray, partnering Yana Sizikova lost to Gabriela Dabrowski and Nathaniel Lammons 6-3 6-4.
Image source, Getty ImagesSecond seed Carlos Alcaraz put on a strong display for the Rod Laver Arena night session crowd, winning 6-4 6-4 6-0 in convincing fashion over world number 60 Miomir Kecmanovic to reach the quarter-finals at Melbourne Park for the first time.
The Spaniard will face sixth seed Alexander Zverev who came through in five sets over Cameron Norrie. The other quarter-final set up today was Daniil Medvedev vs Hubert Hukacz.
Two-time finalist Medvedev beat Portugal's Nuno Borges 6-3 7-6 (7-4) 5-7 6-1 to reach his third Australian Open quarter-final.
Polish ninth seed Hurkacz ended French wildcard Arthur Cazaux's fairytale run in straight sets, 7-6 (8-6) 7-6 (7-3) 6-4, to make his first quarter-final in Melbourne.
Zverev 7-5 3-6 6-3 4-6 7-6 (10-3) Norrie
Jonathan Jurejko
BBC Sport in Melbourne
Image source, Getty ImagesBritain's Cameron Norrie fell short of the Australian Open quarter-finals as sixth seed Alexander Zverev edged an absorbing five-setter by winning a first-to-10 match tie-break.
Norrie, seeded 19th, lost 7-5 3-6 6-3 4-6 7-6 (10-3) to Germany's Zverev.
After one of his best performances at a major to beat Casper Ruud in the third round, Norrie played even better against Olympic champion Zverev.
But his mistakes in the deciding tie-break proved costly as Zverev won.
Norrie, who had never previously beaten a top-10 opponent at a Grand Slam event, had been bold and aggressive in the key moments as he twice fought back to level.
However, he was unable to execute as well in the final-set tie-break and looked understandably dejected as he walked back to the locker room.
"At the end of the day it is a Grand Slam and everyone is playing their best here. Cam has been playing amazing tennis and I'm just happy to be through," said a relieved Zverev.
Zverev, who is aiming for his first Grand Slam title, will face Spanish second seed Carlos Alcaraz in the quarter-finals on Wednesday.
Image source, Getty ImagesWe still have one more women's singles match to come on Rod Laver Arena but in all three round four matches played so far on Monday, seeded players were knocked out by unseeded opponents.
Ukrainian qualifier Dayana Yastremska, ranked 93rd in the world, beat two-time champion Victoria Azarenka 7-6 (8-6) 6-4 to make her first Grand Slam quarterfinal.
The 23-year-old will play Czech teenager Linda Noskova who advanced to the final eight thanks to a retirement from 19th seed Elina Svitolina, who was visibly upset as she waved goodbye to the Margaret Court Arena crowd.
Italian 26th seed Jasmine Paolini lost 6-4 6-2 to world number 75 Anna Kalinskaya, who had previously never made it past the second round at a Grand Slam
Let's bring you up to speed with what's happened so far on day nine...
Alcaraz 6-4 6-4 6-0 Kecmanovic
Image source, Getty ImagesOn his injury last year and getting to the quarter-finals for the first time:
"I am feeling better and better every day. Obviously every match I’ve played in Rod Laver, I’ve been feeling more comfortable and it is a pleasure to play in this arena.
"As I said many times, the people in Melbourne are so kind and I am enjoying that. I am playing my best level and I hope to feel better and better every day."
On facing Alexander Zverev next:
"Playing at this level I will have my chances. He has played tough matches as well, tiebreaks in the fifth set. It is going to be tough for him as well.
"At the US Open he was struggling as well before coming to my match and he was 100%.
"I love playing against Sasha – I think we bring a high level of tennis, high intensity. I will try to bring my best tennis and let’s see what happens."
Alcaraz 6-4 6-4 6-0 Kecmanovic
Image source, Getty ImagesLet's hear from Carlos Alcaraz, who reaches the quarter-finals in Melbourne for the first time:
On his victory and what was working well:
“Well I think everything. I did everything almost perfectly. In 2022 it was really close and high level on both parts. I think today was a high-level match as well. I pushed him to the limit in every point and obviously he has played a lot of matches in five sets. – a lot of tough matches before this one, so he was not 100 percent.
"In every ball I pushed him to the limit and moved him side to side. I took my chances and I think it was a very good match for myself."
The Australian Open men's singles final eight is now complete, with two repeats of quarter-finals we saw at the US Open last year:
[1] Djokovic v Fritz [12]
[4] Sinner v Rublev [5]
[9] Hurkacz v Medvedev [3]
[6] Zverev v Alcaraz [2]
Alcaraz 6-4 6-4 6-0 Kecmanovic
Speaking to Jim Courier on court, Carlos Alcaraz says "everything" was working for him during the match today, making the Melbourne crowd laugh.
We'll have his full thoughts for you shortly...
Alcaraz 6-4 6-4 6-0 Kecmanovic
Alcaraz takes the match at the very first opportunity in what was a commanding display on Rod Laver Arena.
Miomir Kecmanovic didn't do much wrong. The Serb just couldn't get a foothold in this fourth-round match and any errors he made were instantly punished by the second seed.
*Alcaraz 6-4 6-4 5-0 Kecmanovic
The second seed has been in supreme form in front of the night session crowd on Rod Laver Arena.
Carlos Alcaraz hits a perfect drop shot to get match point to make the last eight of the Australian Open for the first time in his young career.
*Alcaraz 6-4 6-4 5-0 Kecmanovic
Leon Smith
GB Davis Cup captain on BBC Radio 5 Sports Extra and BBC Sounds
Kecmanovic must be thinking 'what do you have to do here.'
Incredible play from Alcaraz.
*Alcaraz 6-4 6-4 5-0 Kecmanovic
Do you smell that? I think Carlos Alcaraz is opening up a bakery...
The two-time Grand Slam champion takes Miomir Kecmanovic to deuce and on break point, hits a clean backhand down the line winner which puts him within one game of a bagel set.
Alcaraz 6-4 6-4 4-0 Kecmanovic*
Alcaraz is everywhere. The Spaniard lunges left and right to stay in the rally. Eventually Miomir Kecmanovic gets an easy-looking overhead at the net but he puts it wide.
30-30.
Alcaraz 6-4 6-4 4-0 Kecmanovic*
Image source, Getty ImagesSecond seed Carlos Alcaraz and world number 60 Miomir Kecmanovic have only played once before but it was a belter at the Miami Masters event in 2022.
Spaniard Alcaraz edged it 7-6 (7-5) 3-6 7-6 (7-5) in a match full of points which got the crowd screaming and off their feet in excitement. Alcaraz stole the headlines during what was his breakout season but it takes two to make a great match and Serb Kecmanovic impressed by keeping up with Alcaraz's heroics whilst pulling off some of his own.
Kecmanovic will need to pull off a remarkable comeback if he's to recreate that night in Miami.
Image source, Getty ImagesAlcaraz 6-4 6-4 4-0 Kecmanovic*
It's been delightful from Carlos Alcaraz. He plays a lovely drop shot to go 30-0 up and a wayward forehand return from Miomir Kecmanovic gifts Alcaraz his fifth game in a row.
*Alcaraz 6-4 6-4 3-0 Kecmanovic
A flashing cross-court forehand winner from one corner to the other, accompanied by that trademark Alcaraz grunt, gives the former world number one a double break in the third set.
The Spaniard is racing away from Serb Miomir Kecmanovic now.