Jenny Shin surged into the day-two lead at the Kia Classic with a 7-under 65 at Aviara Golf Club in Carlsbad, Calif.
World No. 1 Lydia Ko is a stroke off the pace at 9 under overall. Ko shot a 5-under 67 on Friday, and is tied with Brittany Lang, who shot a 4-under 68. It was Ko's eighth consecutive round under par.
One stroke behind Ko and Lang sit world No. 2 Inbee Park and Hy Joo Kim. Kim fired a 6-under 66 Friday to jump 10 spots.
Defending champ Cristie Kerr missed the cut and won't defend her title.