American Alison Walshe birdied the 17th hole in an opening-round 6-under 66 that gave her a one-stroke lead over Jessica Korda at the Australian Ladies Masters at Royal Pines on Friday.
Korda, the daughter of former tennis player Petr Korda, won last year's Women's Australian Open at Royal Melbourne in a playoff for her first LPGA Tour victory.
Belen Mozo of Spain, Australia's Stacy Keating, American Dori Carter and Thailand's Nontaya Srisawang were two strokes behind.
Seven-time champion Karrie Webb was in a large group four shots back in the season-opening event of the Ladies European Tour and Australian circuit.
Cheyenne Woods, Tiger Woods' niece, shot 74.