12:35 CET - A huge win for Ukraine's Elina Svitolina, who has beaten eighth seed Mirra Andreeva in straight sets 6-2, 6-4 to progress into the quarter-finals.
11:00 CET - Home favourite Alex De Minaur has set up a fascinating quarter-final with world number one Carlos Alcaraz after making light work of Alexander Bublik, winning 6-4, 6-1, 6-1 in an impressive and dominant display.
10:35 CET - Some breaking news to bring you as Jakub Mensik has withdrawn from his match against Novak Djokovic, handing the Serbian a walkover into the quarter-finals.
10:20 CET - Learner Tien becomes the youngest Australian Open quarter-finalist in 11 years after an utterly dominant and impressive 6-4, 6-0, 6-3 victory against Daniil Medvedev.
09:30 CET - Alexander Zverev has booked his place in the quarter-finals after an utterly dominant 6-2, 6-4, 6-4 victory against Argentina's Francisco Cerundolo. That is the first time in this year's championship where Zverev has come through in straight sets.
Coming into his own at the business end of the competition will spell danger to his rivals...
08:20 CET - World number three Coco Gauff has come through an epic battle against 19th seed Karolina Muchova to win 6-1, 3-6, 6-3 and book her place in the quarter-finals.
07:10 CET - Carlos Alcaraz was well on course when we last updated you, and he is now into the quarter-finals after a convincing 7-6 (6), 6-4, 7-5 victory against Tommy Paul.
04:55 CET - Carlos Alcarez is currently up 7-6(6), 6-4, 2-2 on Tommy Paul in the final men's match ahead of the quarter-finals.
Still coming up on the women's side is Coco Gauff's matchup against Karolina Muchova after experiencing a slight delay due to a doubles match.
04:35 CET - The American Iva Jovic makes quick work of Yulia Putintseva, taking just 54 minutes to defeat her in straight sets 6-0, 6-1.
The 18-year-old now moves into her first-ever Grand Slam quarterfinals as she has yet to drop a single set the entire tournament.
03:20 CET - Victoria Mboko came back after being down 4-1 in the second set, but Aryna Sabalenka eventually won in the tiebreak to finish off the match in straight sets 6-1, 7(7)-6(1).
Sabalenka now advances to her fourth-straight Australian Open quarterfinals matchup and is 9-0 in 2026.
23:15 CET - Welcome back to the Tennis Tracker tonight, as the fourth round finally begins at the Australian Open, with several excellent clashes to look forward to in the second week of the opening Grand Slam of the year.
Up first on Rod Laver Arena at 01:30 CET, world number one Aryna Sabalenka comes up against young starlet Victoria Mboko in a fascinating clash, which is then followed by fellow number one Carlos Alcaraz's meeting with Tommy Paul.
The night session begins at 09:00 CET, with home favourite Alex de Minaur clashing with the in-form Alexander Bublik, in what should be a fantastic occasion. The final match on the main court sees two players who have started the season superbly, Mirra Andreeva and Elina Svitolina, go head-to-head.
The singles action starts on Margaret Court Arena at 04:30 CET, as Coco Gauff takes on Karolina Muchova in another excellent match. That is swiftly followed by a match-up that proved to be so captivating on several occasions last season, with Daniil Medvedev facing Learner Tien. Prepare for a slugfest.
On John Cain Arena at 03:00 CET, another wonderful young player, Iva Jovic, comes up against Yulia Putintseva, with Alexander Zverev butting heads with Francisco Cerundolo afterwards.