The tournament drawcards, Caroline Wozniacki and Venus Williams, remain on course for a final showdown after winning their quarter-finals at the ASB Classic WTA tennis event in Auckland.
Top-seeded Wozniacki overcame Julia Goerges 6-4 6-4, while Williams saw off Elena Vesnina 6-2 6-4.
Wozniacki faces Barbora Zahlavova Strycova in today's semi-finals, while Williams meets her fellow American Lauren Davis.
Goerges had won three of her previous four encounters with Wozniacki but could not get the better of the Dane this time, despite serving seven aces.
Strycova clawed her way back from 5-2 in the second set to beat Coco Vandeweghe 6-4 7-5, winning 20 of the last 23 points.