US Open champion Coco Gauff brushed aside Varvara Gracheva to reach the Auckland Classic semi-finals as she builds toward the Australian Open.
The Australian Open gets under way in Melbourne on 14 January.
Meanwhile, Briton Harriet Dart has reached the biggest final of her career at the Canberra International.
Dart, 27, beat American Katie Volynets 7-5 3-6 7-5 in the WTA 125 series tournament, which is the rung immediately below the full WTA Tour.
The British number three faces Spain's Nuria Parrizas Diaz in Saturday's final and then heads to Melbourne where Australian Open qualifying begins on Monday.