Dayana Yastremska - who had to battle through qualifiers for the grand slam - defeated Linda Noskova to reach the Australian Open semi-finals on Wednesday.
Coco Gauff came through a three-hour battle with Ukraine's Marta Kostyuk to reach the semi-finals of the Australian Open for the first time.
Elina Svitolina lasted just three games of her fourth-round clash with Linda Noskova before she retired hurt at the Australian Open on Monday.
Top seed Iga Swiatek was forced to dig deep to get past Danielle Collins on Thursday's action in the Australian Open.
Rising teenage star Mirra Andreeva breezed past the experienced Ons Jabeur in the second round of the Australian Open on Wednesday.
Emma Raducanu made a convincing grand-slam return with victory over Shelby Rogers in the first round of the Australian Open.