09:38 CET - Elina Svitolina has taken a one-sided opening set on Rod Laver Arena, with the Ukrainian punishing an error-strewn start from Coco Gauff to win it 6-1 in just 29 minutes.
09:03 CET - We're just minutes away from the second women's quarter-final of the day as third seed Coco Gauff comes up against Elina Svitolina.
Follow point-by-point coverage here.
07:48 CET - Last year's runner-up Alexander Zverev has sealed his spot in the semi-finals after an impressive 6-3, 6-7(5), 6-1, 7-6(3) triumph over rising star Learner Tien.
The German, who continues to chase an elusive Grand Slam title, will face either top seed Carlos Alcaraz or home hope Alex de Minaur in the last four.
05:55 CET - Alexander Zverev found another gear in that third set, breaking Learner Tien twice en route to taking a two sets to one lead. The German won the third set 6-1, winning 88% of his first serve points. He is one set away from another semi-final appearance.
05:30 CET - Learner Tien does not give up, and wins the second set in a tiebreak against Alexander Zverev 7-6 (5). Neither player was broken in what has been a high quality match so far. The American was behind in the tiebreaker, but won the last four points make it one set apiece.
04:20 CET - The first set goes the way of Alexander Zverev, as he leads 6-3 versus Learner Tien. Just one break of serve was enough for the German, who was very strong on his serve. Follow the match on Flashscore.
03:15 CET - Aryna Sabalenka is the first player to book her place in the semi-finals of the Australian Open after knocking off Iva Jovic 6-3, 6-0. The top ranked player was never broken in the match, hitting 30 winners to just 17 unforced errors. She faces the winner of the other match today between Coco Gauff and Elina Svitolina.
02:45 CET - An hour of tennis later, and Aryna Sabalenka wins the first set against Iva Jovic. Saving all three break points faced, the world number one managed to hold firm when serving for the set. Follow the match on Flashscore.
01:45 CET - The first match of the day takes place between the world number one Aryna Sabalenka and teenage star Iva Jovic. Follow the action on Flashscore.
23:50 CET - With just over 30 minutes to go until this year's Australian Open quarter-finals get underway, click here to read our preview of the first set of matches.
23:30 CET - Good evening and welcome to today's Tennis Tracker, as the Australian Open quarter-finals get underway in a sizzling Melbourne!
Play gets started in a couple of hours at 01:30 CET, with women's top seed Aryna Sabalenka facing American sensation Iva Jovic on the Rod Laver Arena.
Following that clash, former finalist and men's third seed Alexander Zverev takes on rising star Learner Tien, who comfortably dispatched Daniil Medvedev in the previous round.
Later on, in the night session, Coco Gauff comes up against Elina Svitolina at around 09:00 CET, before Career Grand Slam-chasing Carlos Alcaraz faces home favourite and sixth seed Alex de Minaur.
Check out the full men's schedule here and the full women's draw here.