Iga Swiatek delivered a commanding performance to breeze past Emma Raducanu on Saturday, securing a spot in the Australian Open last 16.
Meanwhile, 38-year-old Gael Monfils shocked fourth-seed Taylor Fritz in a thrilling upset.
In a lopsided clash between two former US Open champions, Swiatek triumphed 6-1, 6-0, showcasing her determination to claim her maiden title in Melbourne.
Swiatek, a five-time Grand Slam winner, has never advanced beyond the semi-finals at this tournament. She next faces world number 128, Eva Lys, who became the first woman’s “lucky loser” to reach the fourth round since the Australian Open moved to Melbourne Park in 1988.
Elsewhere, American Emma Navarro fought hard for a 6-4, 3-6, 6-4 victory over three-time Slam finalist Ons Jabeur.
Navarro, the daughter of billionaire Ben Navarro, credited her childhood training for her resilience, recalling family bike rides that tested her stamina.
Sixth seed Elena Rybakina also advanced despite requiring a medical timeout to address a back spasm.
Monfils rolled back the years to defeat Fritz 3-6, 7-5, 7-6 (7/1), 6-4. The French veteran, now ranked 41st, is enjoying a late-career resurgence, having become the oldest singles champion in ATP history just a week ago at the Auckland Classic.
Monfils joked that he had “warmed up the court” for his wife, Ukrainian player Elina Svitolina, who will face fourth-seeded Jasmine Paolini next.
In other matches, defending champion Jannik Sinner seeks to continue his title defence against Marcos Giron.
The young Italian could face 13th seed Holger Rune in the fourth round if the Dane overcomes Miomir Kecmanovic.
Meanwhile, 19-year-old qualifier Learner Tien will aim to extend his fairytale run after stunning Daniil Medvedev in a five-set thriller earlier in the week.
The tournament continues to deliver drama and surprises, with fans eagerly awaiting further twists as the action unfolds.
