World number one Annika Sorenstam showed her class with a second-round 69 to share the halfway lead at the US Women's Open.

The Swede was one of the few players to break par on the Prairie Hills course and is on one under along with American duo of Juli Inkster and Laura Diaz.

Sorenstam, the champion in 1995 and 96 has won on her last two outings and seven times in all this year.

She swept to the top of the leaderboard with three birdies in her final six holes although she bogeyed her final hole of the day.

"I'm happy, but I left a few out there," she said. "I was disappointed with my putting, but one under wasn't bad for a tough day.

"Still, I usually improve over the weekend."

Janice Moodie leads the British challenge with a 72 to move to three over for the tournament with Mhairi McKay another two shots back.

English pair Joanne Morley and Karen Stupples, who both shot second round 68s also make the cut alongside Laura Davies (eight over) and Catriona Matthew (nine over).

Pre-tournament favourite Karrie Webb will miss the final two rounds after missing the cut for the first time in 56 tournaments.

The Australian, who was bidding for a third US Open in a row followed up her first round 79 with a 73.

US Women's Open leading second round scores (U.S. unless stated):

139: Juli Inkster 67 72, Annika Sorenstam (Swe) 70 69, Laura Diaz 67 72
140: Michele Redman 71 69, Shani Waugh (Aus) 67 73
141: Jill McGill 71 70
142: Michelle Ellis (Aus) 71 71, Jenna Daniels 72 70
143: Stephanie Keever 72 71, Charlotta Sorenstam (Swe) 73 70, Janice Moodie (GB) 71 72
144: Cyndy Schreyer 70 74, Brandie Burton 70 74, Kim Saiki 68 76, Dawn Coe-Jones (Can) 72 72, Sherri Turner 73 71
145: Jennifer Rosales (Phi) 73 72, Carin Koch (Swe) 73 72, Mhairi McKay (GB) 70 75, Danielle Ammaccapane 74 71, Cristie Kerr 74 71, Kelly Robbins 71 74
146: Rachel Teske (Aus) 75 71, Lynnette Brooky (NZ) 73 73, Jackie Gallagher-Smith 70 76, Jang Jeong (S Korea) 73 73, Tracy Hanson 75 71, Joanne Morley 78 68 (GB), Allison Finney 73 73, Kelli Kuehne 70 76, Beth Bauer 74 72, Patricia Meunier Lebouc (Fra) 76 70, Kim Mi Hyun (S Korea) 74 72, Ara Koh (S Korea) 74 72, Susan Ginter-Brooker 74 72, Audra Burks 70 76, Leslie Spalding 73 73, Liselotte Neumann (Swe) 74 72, Lorie Kane (Can) 69 77, Lee Jung Yeon (S Korea) 71 75, Raquel Carriedo (Spa) 75 71