Annika Sorenstam and Se Ri Pak, the LPGA Tour's top two players, were four strokes back along with Patricia Meunier-Lebouc. Pak and Sorenstam, paired together, shot 70s, and Meunier-Lebouc had a 71.

"Everybody expected even before this tournament began that this course would bring out the best players at the top," Park said.

The South Korean player recovered from a double-bogey on the par-3 5th hole, when her ball bounced into a stream, with four birdies over the next 13 holes.

"Starting off I could not hit greens to save my life," Park said. "The greens were not that easy today."

The weather at the Kingsmill course, site of a PGA Tour event last year _ changed from hot and sunny Friday to cold and wet Saturday, making the rough thicker and tee shots more critical.

"This is a U.S. Open-style course, in my opinion," said Kerr, attempting to become the tour's first U.S. winner since Meg Mallon last summer in the Canadian Women's Open. "The rough is thick; there aren't many par 5s."

Foreign players have won 16 straight events, and held 13 of the top 15 spots Saturday. Juli Inkster (U.S. Women's Open) and Mallon are the only U.S. winners in the last 28 tournaments.

The course's three par-5 holes, though, are providing players their best scoring opportunities. The lengths _ 491, 467 and 458 yards _ allow many players to reach the green in two. Park has played the par 5s at 5 under over three days. Kerr has played them 8 under and Sorenstam, the tour leader in driving distance, is 7 under.

Sorenstam and Pak formed a Dream Team pairing Saturday, but neither was able to make a move up the leaderboard. Sorenstam narrowly missed birdie putts on 15 and 16, then hit her tee shot on the par-3 17th to 4 feet for a birdie that moved her to 6 under. But she bogeyed the 18th to finish five under.

"I played pretty well, but I felt like I didn't get the most out of my round," Sorenstam said. "For three days I've been grinding and grinding. I've just been very close."

It was the first time this year that Pak and Sorenstam had been paired together.

"We're both very competitive. I enjoy playing with her because we inspire each other to do our best," Sorenstam said.

Ochoa, who had shared with the lead with Park at the beginning of play on Saturday, made her first bogey of the tournament on the fourth hole, when she drove her tee shot into a valley of deep rough left of the green.

She then bogeyed four of her next nine holes, and looked to be falling away entirely before hitting consecutive birdies on 15 and 16.

"I was close to being out of contention, but I just pulled it together on the last five holes," Ochoa said. "I told myself, 'Just settle down.'"

For the second straight day, Pettersen played herself out of the lead with bogeys on two of the final three holes. On Saturday she bogeyed 17 and 18 to finish six under par.