Aussie action: The best images from the third round in Melbourne
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Two winning streaks collided as Hobart champion Elena Rybakina took on Adelaide champion and World No.1 Ashleigh Barty.
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Barty prevailed over Rybakina in straight sets in the contest between last week's trophy-winners.
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Last year's runner-up Petra Kvitova was at her formidable best in dismissing Shenzhen champion Ekaterina Alexandrova for the loss of three games.
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Ons Jabeur made history by becoming the first Tunisian player to reach the second week of a Grand Slam - ending Caroline Wozniacki's career in the process.
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Jabeur showed off her creative game in a three-set epic to conclude 2018 champion Wozniacki's farewell tour.
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Wozniacki was honored after the match in a special on-court ceremony, joined by her team - including husband David Lee, father Piotr and brother Patrik.
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Meanwhile, Wang Qiang was giving seven-time champion Serena Williams a battle, going up a set and a break on the eighth seed.
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The stage seemed to be set for a quintessential Serena comeback after the former World No.1 fought back to take the second set in a tiebreak.
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Wang showed her frustration as she failed to serve out the match in the second set, and let her first two match points slip by in the third set.
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Ultimately, though, there was joy for Wang - who gained sweet revenge over Serena for her 44-minute rout in the US Open quarterfinals.
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Serena, meanwhile, vowed to work harder than ever in her quest for a 24th Grand Slam trophy.
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Alison Riske continued her surge of the last seven months, coming from a set down to topple Julia Goerges and reach her third Grand Slam second week.
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There was joy for Maria Sakkari, who upset Madison Keys to reach the fourth round of a major for the first time after seven previous third-round losses.
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Defending champion Naomi Osaka had easily beaten teenage phenom Coco Gauff at the US Open, but after a litany of errors found the tables turned.
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Fifteen-year-old Gauff reached the fourth round for the second time in her first three majors with a career-best straight-sets upset of Osaka.
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Sofia Kenin saved four set points in the first set and one in the second to overhaul Zhang Shuai 7-5, 7-6(7) - setting up an intriguing tilt against Gauff.
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Angelique Kerber and Camila Giorgi kicked the weekend off with a three-set encounter that went the way of the German.
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The upsets continued on Saturday as Anastasia Pavlyuchenkova won a couple of tiebreaks to beat Karolina Pliskova in a two-hour, 28-minute marathon.
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Anett Kontaveit was in top form to beat No.6 seed Belinda Bencic in just 50 minutes, dropping only one game.
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Iga Swiatek overcame Donna Vekic to reach the last 16 in Melbourne for the first time.
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No.4 seed Simona Halep beat Yulia Putintseva to continue her progress into the second week.
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Elise Mertens signed for a place in round four by easing past Catherine Bellis.
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Garbiñe Muguruza showed the form that made her a two-time major winner with a commanding success over No.5 seed Elina Svitolina.
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Kiki Bertens was the final women through to the last 16, overcoming Zarina Diyas in straight sets.
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