World number one Inbee Park moved into the lead after the third round of the LPGA Championship.
The Korean fired her second 68 in a row at Locust Hill to reach 10-under-par overall, one ahead of Morgan Pressel.
She trailed Pressel by five shots at the turn but finished with four birdies in the last six holes as the American faltered and is now well placed to secure her second major win in a row - and third of her career.
Park has won three times already this season, including the Kraft Nabisco Championship in April.
Pressel, two ahead at the start of the day, is on nine under after a third-round 71, while Park's compatriot Jiyai Shin managed a 69 to leave her one further back.
The players head straight back out on Sunday afternoon for the final round of the rain-delayed tournament. The entire opening day was washed out on Thursday.