Agnieszka Radwanska beat China's Li Na 6-3 6-4 to reach the final of the Sydney International.
The Polish top seed plays Dominika Cibulkova in Friday's final after the Slovakian won 6-2 4-6 6-3 against Germany's Angelique Kerber.
Spaniard David Ferrer also maintained impressive pre-Australian Open form.
He defeated Slovakia's Lukas Lacko 6-2 6-1 to book an Auckland Open semi-final place and will play Gael Monfils, who defeated Tommy Haas 3-6 7-5 6-3.
World number four Radwanska, 23, who also won the Auckland Classic last week and has started the year with eight straight wins, said: "I have played good tennis in the last couple of days and I hope I can continue playing at this level."
The 30-year-old Ferrer, ranked fifth in men's tennis, is aiming for his fourth Auckland title before the Australian Open, where he will be seeded fourth because of Rafael Nadal's absence.