Wie in trio of leaders 

American amateurs Michelle Wie, 15, and Morgan Pressel, 17, shared the lead with Britain's Karen Stupples after the third round of the US Women's Open on Sunday.

World number one Annika Sorenstam of Sweden, bidding for the third leg of a possible grand slam of four majors in one season, was five shots back after struggling to a 73 for 219, six over.

Wie, runner-up to Sorenstam at the LPGA Championship two weeks ago, had a 72 for a one-over aggregate of 214.

The tall Hawaiian was joined on that mark by Pressel (70) and British Open champion Stupples (69).

No teenager has even won a women's major.

Another American teenager, 18-year-old rookie professional Paula Creamer, shared fourth spot on 215 with South Koreans Kim Birdie and Jo Young.

Frenchwoman Catherine Lacoste became the only amateur to win this title in 1967 although American Jenny Chuasiriporn came close in 1998 when she lost a 20-hole play-off to South Korea's Pak Se Ri, the youngest winner to date at 20 years nine months.

The youngest winner of a women's major was Canada's Sandra Post, who was aged 20 years 19 days when she captured the 1968 LPGA Championship.

"I definitely think I can win," Wie told reporters.

"Today I felt I played much better than the last two days and I think I'll need to shoot under par tomorrow.

"It's great to have two amateurs at the top. I think it shows how much better we are these days."

Pressel has already made US Open history after she qualified for the tournament at the age of 12.

After a tidy round of three birdies and two bogeys, she said: "This is so exciting. I came here to win and now I'm in a great position.

"My caddie helped me stay calm and now we've got another big day to play. But I am here to win, second and third don't matter. "

Stupples, who had an eagle-albatross start to her final round at last year's British Open at Sunningdale, England, hit six birdies in a row from the ninth on Saturday.

"I know that the teenagers are young and fearless," she said. "But I love the challenge of the big tournaments.

"I've not played well this year but I felt my game coming round in the last few weeks and I knew I just needed a few breaks."

Sorenstam, trailing the leaders by five strokes, said she would attack in the final round.

"I've got nothing to lose so I'll go out tomorrow, give it my all and play a little more aggressive," said the Swede.