Sorenstam, the world's top-ranked player, was at 4-under 212, with Norway's Suzann Pettersen at 213 after a 69.
France's Gwladys Nocera, trying to win a spot on the team for next month's Solheim Cup at Crooked Stick, Ind., was at 214 after three-putting the last hole for a 71. Natalie Gulbis, an American and the highest-ranked player in the field behind Sorenstam, shot a 69 for 215.
Sorenstam made four birdies on the back nine that has three of the Barseback course's five tough seaside holes. On the front nine, the Swede had three birdies and her only two bogeys.
``To finish birdie-birdie on this course -- two difficult holes -- was promising for tomorrow. Compared to yesterday, this was quite an improvement,'' said Sorenstam, who had a 75 Friday in tougher weather.
``There's nothing better than playing in the last group on a Sunday and having a chance to win a golf tournament,'' she added. ``It's going to be a lot of fun to play with Suzann tomorrow.''
Pettersen said: ``Hopefully, I can make a few more putts tomorrow. I'm only one behind Annika, and anything is possible.''
Second-round leader Liselotte Neumann had a 76 for her worst round on this course and dropped to 218 with fellow Swede Helen Alfredsson.
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