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 quarterfinals 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.