Two-time champion Victoria Azarenka brushed aside Elina Svitolina to reach the Australian Open fourth round for the first time since 2016.
The Belarusian world number 25, champion in Melbourne in 2012 and 2013, won 6-0 6-2 against the Ukrainian 15th seed.
Azarenka will now play French Open champion Barbora Krejcikova.
Czech Krejcikova, seeded fourth, came from behind to beat Latvia's Jelena Ostapenko 2-6 6-4 6-4.
Australia's world number one Ashleigh Barty is in action against Italy's Camila Giorgi from 08:00 GMT on Friday.
Defending champion Naomi Osaka also features in the night session at Melbourne Park, taking on American Amanda Anisimova.