Pat Hurst, Seminole's Brittany Lincicome and South Korea's Eun-hee Ji each shot 6-under 66 on Thursday to share the lead after the first round of the Evian Masters.
Michelle Wie, the 17-year-old star from Hawaii, shot 73 and has not broken par since finishing tied for second at this event last year.
On a day of low scoring, the leaders were one shot ahead of Christina Kim of the United States and Kyeong Bae and Jin Joo Hong of South Korea.
Hurst, who is in her 13th season on the tour, started with a birdie at the first and finished with an eagle on the 18th.
The 21-year-old Ji was undaunted by her Evian Masters debut, holing out with her second shot at the third hole for eagle. She also birdied the fourth, seventh and ninth holes.
"I hit a 9-iron from 130 yards," Ji said. "I played good all day."
The 21-year-old Lincicome, who won the Ginn Open in April, eagled the ninth and almost did the same at the 18th.
Karrie Webb, the defending champion from Australia, stayed in contention with a 70.
Lorena Ochoa fought hard to finish with par 72.
"It was one of the most up-and-down rounds I've had this year," Ochoa said. "I had six birdies, two double bogeys and two bogeys. It could have been a very bad day."
PGA: Playing in perfect scoring conditions on Angus Glen's North Course, Hunter Mahan had three eagles to finish with 9-under 62 to match the Canadian Open tournament record, taking a two-stroke lead in Ontario.
"Golf's a funny game," Mahan said. "Sometimes you have it and sometimes you don't. Sometimes you do everything you're supposed to do and it doesn't work out. You have to be patient and you've just got to keep working."
Mahan eagled the ninth, 11th and 18th holes.
Australia's Steve Allan was second after 64, and Canadian David Hearn was another stroke back along with Tripp Isenhour. Mark Calcavecchia shot 67 in the breezy afternoon session. Jim Furyk had 69, also in the afternoon.
SENIOR PGA: Nick Faldo recaptured enough of his famous competitive edge to shoot 3-under 68 for a share of the lead in his senior tour debut. The six-time major champion made six birdies - including a 3-foot putt at the last - in the first round of the Senior British Open at Muirfield. Joining Faldo at 3 under were 65-year-old Dave Stockton, a regular on the Champions Tour, Nick Job and Gordon J. Brand.
EUROPEAN PGA: Simon Khan shot 7-under 65 for the first-round lead at the Deutsche Bank Players Championship in Germany. Khan, who failed to qualify for last week's British Open, finished a stroke ahead of two other Englishmen - Lee Slattery and Oliver Wilson.