Despite two lengthy rain delays, Sorenstam ended the day with 36-hole total of 12-under 130, three strokes better than Lorena Ochoa (68) and Jeong Jang (66).

"Overall, I'm very happy with my round," Sorenstam said. "It was the kind of day with wind, some rain, little delay when we made the turn, so I'm very pleased that I hang in there. I hit some good shots (and) rolled in some beautiful putts to save par."

Sorenstam, a two-time winner on the women's tour this season, is trying for her 72nd LPGA win.

Meena Lee (67) is alone in fourth place at 8-under 134 and five players are tied for fifth at 6-under 136.

Defending champion Suzann Pettersen (71) is tied for 54th place at even-par 142.