Brooke Henderson remained bogey-free to take the second-round lead in the LPGA's Lotte Championship with Australia's Hannah Green tied for 24th.
Henderson, the 20-year-old Canadian ranked 14th in the world, birdied four of her first six holes to surge into the lead in relatively calm morning conditions.
She finished with a six-under 66 at Ko Olina Golf Club, the day's low round, to get to 10 under.
No one could catch the five-time LPGA Tour winner as the wind gusted later in the day.
Green was the best-placed Aussie after back-to-back rounds of 72 to be even while Minjee Lee carded a 75 on Friday to be one over.
Top-ranked Shanshan Feng, the first-round leader, was two strokes off the pace set by Henderson with Mo Martin after a bogey-free 69. Martin, the 2014 Women's British Open, had a 67.
Pernilla Lindberg and Inbee Park were together again on the leaderboard at six under, two weeks after Lindberg beat Park on the eighth extra hole in the major ANA Inspiration.
Hawaii's Michelle Wie, who has risen 100 spots to No. 13 since last March, made her 16th straight cut.
She was one over after a 73. Defending champion Cristie Kerr also shot 73 and was another shot back.
