Barty defeated Camila Girogi in straight sets
After an early break, the 25-year-old Wimbledon champion fended off three break points to go 5-2 up in the opening stanza and then broke Giorgi to seal the set.
A break for 4-2 put Barty in charge of the second set and three games later she was bathing in an ovation from the centre court crowd having secured her place in the last 16 at Melbourne Park for the fourth straight year.
“I thought tonight was really clean, I looked after my service games really well,” said Barty.
“I was able to keep the momentum going, make returns when it mattered most at the important moments, pretty good performance I think.”
Naomi Osaka was playing American Amanda Anisimova on Margaret Court Arena on Friday evening with the winner to face Barty – et a shock result came as reigning champion Osaka bowed out.