ADELAIDE, Australia — Canadian-based South Korean SooBin Kim shot a course-record 9-under 63 on Thursday to leave defending champion and top-ranked Lydia Ko seven strokes behind at the Women’s Australian Open.

Kim’s bogey-free opening round came after starting on the 10th hole of The Grange’s West course. She had a three-stroke lead over American Casey Grice and Germany’s Caroline Masson.

Ko bogeyed two holes on her first nine after starting on the 10th, but had three birdies on the back nine for her 70.