Kim Clijsters, who set off at a gallop in the first round, showed little sign of a let-up as she cantered through to the last 16 with a straight sets win over Samantha Reeves.
The world number two and second seed took just 50 minutes to secure a 6-1 6-2 victory over the 24-year-old American and, after dropping just seven games in three rounds, looks to be on course for a third successive Grand Slam final.
Clijsters dropped her serve for the second time in the Championships but it was merely a hiccup in her irresistible march to the fourth round.
Reeves had lost to the big-hitting Belgian in the first round at Wimbledon last year and in the opening round of the Australian Open and she showed little sign of breaking her duck.
She had no answer to the powerful forehands and crisp passing shots of the 20-year-old Clijsters, who was in imperious form under the gaze of boyfriend Lleyton Hewitt.
She will now play Ai Sugiyama for the third time this year after the Japanese number one beat Nathalie Dechy, of France, 6-4 6-4.
Sugiyama won their meeting in the final in Scottsdale, Arizona, but Clijsters gained her revenge in the Italian Open last month.