Coming off her win at the U.S. Women's Open, Sorenstam still has a long way to go if she is to win her second straight event. She will be joined in the quarterfinals by the remainder of the top-five seeds -- Michelle Wie, two-time winner this year Lorena Ochoa, Kraft Nabisco champion Karrie Webb and Paula Creamer.
The quarterfinal round was rounded out by 27th-seed Sophie Gustafson, 39th-seed Brittany Lincicome and eighth-seed Juli Inkster.
Sorenstam took command of her match with Lang by winning four of the first six holes at the Highlands Course at Hamilton Farm Golf Club.
Lang won her only hole of the match at the 11th, but Sorenstam birdied the next and the match was over one hole later as Lang bogeyed the par-4 13th.
Inkster won three straight from the second versus 56th-seed Marcy Hart. Hart won back-to-back from the seventh, but Inkster took the ninth and 11th. Hart dropped the 3 and 2 decision to Inkster with a bogey at the 16th.
Wie and 15th-seed Se Ri Pak went back and forth early on as each women won two of the first six holes. Wie led 1-up around the turn thanks to a birdie on eight. After Pak won the 10th, Wie birdied 11 and 14, both par-5s to go 2- up. Pak cut the deficit to 1-down with a birdie on the 15th, but a bogey on 17 gave Wie a 2 and 1 win.
The 16-year-old Wie will face Lincicome in the quarters. Lincicome won three of the first four, but 55th-seed Kyeong Bae fought back with wins on five and six. Lincicome stretched her lead to as many as 4-up through 12, and cruised to a 3 and 2 victory from there.
Mi Hyun Kim, the 14th seed, and Ochoa were even through 10 holes, but a birdie on 11 gave the Mexican the lead. Ochoa extended her lead on 14 and closed out a 3 and 2 win as Kim bogeyed the 16th.
Ochoa moves on to face Gustafson, who was 2-down after two holes before beating 43rd-seeded Laura Diaz 2 and 1. Gustafson evened the match with Diaz as she took the eighth and ninth holes. She won three of four holes from the 11th to go 3-up, but Diaz won 15 and 16 before Gustafson's birdie on 17 gave her the match.
Thirteenth-seed Pat Hurst, who fell to Sorenstam in the U.S. Women's Open playoff, was 3-down to Webb after five holes. Webb was buoyed by a hole-out eagle at the first. Webb stretched her lead to 4-up after nine and breezed to a 3 and 2 win despite Hurst claiming the 12th and 14th with birdies.
Webb will battle Creamer, who bested fellow teenager Morgan Pressel. Creamer was 4-up after 10 holes before the 12th-seeded Pressel won her first hole at the 11th. Pressel tried to fight back into it as she won on 15 and 16 to get within 2-down. However, Creamer closed out the 3 and 1 win with a birdie on 17.
The quarterfinals will be played Saturday afternoon, with the semifinals and finals slates for Sunday.