07:53 CET - Fifth seed Elena Rybakina has cruised into the quarter-finals in Melbourne after a clinical 6-1, 6-3 triumph over Belgium's Elise Mertens in just 78 minutes.
The 2023 runner-up, who has now won 17 of her last 18 competitive matches, will face either second seed Iga Swiatek or home favourite Maddison Inglis in the last eight.
07:29 CET - What a performance from Lorenzo Musetti! The Italian has swept aside Taylor Fritz in straight sets, 6-2, 7-5, 6-4, to set up a fascinating quarter-final with Novak Djokovic.
It's a first-ever straight-sets victory against a top-10 opponent on a hard court for Musetti, who has now reached the last eight at every Grand Slam.
06:00 CET - Lorenzo Musetti is currently up on Taylor Fritz 6-2, 7-5, 3-2 as things are heating up in the third set!
05:55 CET - Amanda Anisimova defeats Xinyu Wang in straight sets 7-6(4), 6-4 to advance to the quarter-finals.
This makes her first-ever Australian Open quarter-finals, where she'll be taking on Jessica Pegula. Anisimova has now won 16 of her last 18 Grand Slam matches.
03:10 CET - Jessica Pegula takes down defending champion Madison Keys in straight sets 6-3, 6-4.
She will now be advancing to her first Australian Open quarter-finals since 2023 as she remains perfect so far this year.
23:25 CET - Welcome back to the Tennis Tracker this evening, as the fourth round comes to an end in Melbourne, and our quarter-finalists will finally be known.
Up first on the Rod Laver Arena at 01:30 CET is a mega, all-American clash between defending champion Madison Keys and Jessica Pegula - who also happen to be extremely good friends and podcast co-hosts!
That is followed by another massive match between Lorenzo Musetti and Taylor Fritz, and the winner will take on Novak Djokovic, after the Serb was given a free pass into the last eight following Jakub Mensik's withdrawal.
The night session gets underway at 09:00 CET, with Iga Swiatek continuing her quest for the Calendar Grand Slam when she meets surprise package, qualifier Maddison Inglis, who will have the support of her home crowd.
Ben Shelton and Casper Ruud will round out proceedings in what should be a big-hitting battle.
The singles begins on the Margaret Court Arena at 05:00 CET, as former finalist Elena Rybakina faces Elise Mertens, followed by two-time defending champion Jannik Sinner, who comes up against fellow Italian Luciano Darderi.
Finally, at 03:30 CET, Amanda Anisimova goes head-to-head with Xinyu Wang on the John Cain Arena.