Lee Tae-hee shot 4-under 68 Friday to take a two-stroke lead after the second round of the SK Telecom Open.
The South Korean, who leads at 136 overall, had three bogies and seven birdies.
Former champion Park Sang-hyun (67) was in second place and Ryan Haller (68) was third. Haller had four birdies on the front nine but gave one back on the par-3 third.
K.J. Choi (67) and defending champion Matt Griffin (70), who both shot 73 on Thursday, also made the cut.