Mirim Lee followed her opening 10-under 62 with a 71 on Friday in the Women's British Open, leaving her a stroke ahead entering the weekend at tree-lined Woburn Golf Club.
A day after matching the tournament record and falling a stroke short of the major championship mark, the 25-year-old South Korean player had three birdies and two bogeys to reach 11-under 133.
Lee had two front-nine birdies, bogeyed the par-4 13th, birdied the par-5 15th and bogeyed the par-3 17th on the Marquess Course, the hilly, forest layout that is a big change from the seaside links that dominate the tournament rotation.
Thailand's Ariya Jutanugarn and China's Shanshan Feng were tied for second. Jutanugarn had a 69, and Feng shot 68.