Ukrainian Dayana Yastremska has continued her inspired run from qualifying to advance to the Australian Open fourth round for the first time.
Yastremska upset American 27th seed Emma Navarro 6-2 2-6 6-1 in the opening match of day seven at Melbourne Park.
The 23-year-old's reward is a crack at either two-time champion Victoria Azarenka or in-form 11th seed Jelena Ostapenko on Monday for a surprise berth in the quarter-finals.
Azarenka, a semi-finalist last year and champion in 2012 and 2013, takes on the newly crowed Adelaide International winner Ostapenko later on Saturday.
World No.1 Iga Swiatek is playing Czech Linda Noskova in the night session.
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