In a quarterfinal match, Yastremska (No. 24 in the WTA rating) defeated Croatia's Donna Vekic (No. 20) 6-4, 6-3 in one hour and ten minutes.
To reach the final of the tournament, Yastremska will have to beat Aryna Sabalenka of Belarus (No. 12), who defeated Simona Halep of Romania (No. 4) 6-4, 6-2.
The tournament in Adelaide will last until January 18.
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