World number one Aryna Sabalenka will face Marie Bouzkova in the quarter-finals after breezing past Yulia Putintseva.
The Belarusian beat Putintseva 6-4 7-6 (7-2) as she aims to win her 18th career title in Australia.
The 26-year-old will face world number 44 Bouzkova, who beat former world number one Victoria Azarenka, 6-4 6-4 earlier in the day.
Ukraine’s Anhelina Kalinina beat China’s Yue Yuan 6-1 6-4 to set-up a last-eight match against Australia’s Kimberly Birrell, while world number 64 Ashlyn Krueger will take on Russia’s Polina Kudermetova.
Former world number two Ons Jabeur will play Russia’s Mirra Andreeva in the final quarter-final fixture.
