The 26-year-old Belarusian lost her first set of the tournament but that will not prevent her from aiming for a third consecutive final at Melbourne Park in the semi-finals against Paula Badosa, her best friend on the circuit.
The Spaniard (WTA 12/N.11) created a surprise earlier in the day by eliminating the American Coco Gauff (WTA 3) 7-5, 6-4.
Sabalenka has won her last five matches against Badosa after losing the first two.
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