FIRST ROUND SCORES: (US unless stated)
-3 C Na Yeon (Kor)-2 C Kerr, L Ochoa (Mex), J Reynolds -2 H Young Park LevelE Hee Ji, Y Kim (Kor), Candie Kung (Tpe), Kristy McPherson, A Nordqvist (Swe), A Thompson Selected others: +2 L Davies (UK) +3 K Stupples (UK)
Na Yeon Choi shot a three-under 68 to take a one-shot lead after the first round of the women's US Open.
The South Korean began well, carding four birdies from her first five holes on the 6,740-yard long Saucon Valley Old Course in Pennsylvania.
World number one Lorena Ochoa, 2007 champion Cristie Kerr and qualifier Jean Reynolds all share second spot.
Hee Young Park was the only other golfer under par, while Briton Laura Davies is five shots adrift on 72.
Five of the top 11 players on the leaderboard are from Asia, including four South Koreans.
"During my practice rounds I thought this was probably the most difficult course I've ever played in my career," said Choi, in her second season on teh LPGA tour.
"But starting today, I just wasn't very intimidated by this course. I know it's a difficult course, but I was really excited to start my round today, and I thought this was going to be a very, very interesting week for me."
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