Canadian Brooke Henderson birdied her first three holes and the final one Thursday for a 6-under 67 and a share of the early first-round lead at the Australian Ladies Masters.
Henderson, at No. 11 the highest-ranked player in the field, started on the back nine at Royal Pines. She had seven birdies overall and her only bogey came on the par-4 sixth.
Henderson was tied with Denmark's Nicole Broch Larson.
Jiyai Shin, Taiwan's Cheng Ssu-chia and England's Lauren Taylor were a stroke behind and tied for second after 68s.
Australian Su Oh, the defending champion, shot 71. Cheyenne Woods, niece of Tiger Woods and 2014 champion, had a 75.
The tournament, which began under sunny skies and virtually no wind, is sanctioned by the Ladies European and Australian Ladies tours.