(CNN) -- Becky Brewerton of Wales, Sophie Gustafson and Korea's In-Kyung Kim shared the lead going into the final round of the Evian Masters.
Brewerton holes a birdie putt on the way to her three-under 69 to share the lead.
Brewerton, who came into the tournament off the back of victory in the Spanish Open on the Ladies European Tour, carded a three-under-par 69 in her bid for back-to-back wins.
She was joined on 12-under 204 by Gustafson, who continued her charge with a 67, and Kim, who carded a 68.
But the $3.25 million tournament, which is co-sanctioined by the LPGA and Ladies European Tour, is wide open with a host of leading players within striking distance.
Japan's Ai Miyazato looked set to make it a four-way tie but she bogeyed the last hole to drop to 11 under alongside America's Cristie Kerr, who shot the joint best round of the day with Gustafson.
Kerr is looking to bounce back after her last round collapse as Eun Hee Ji of South Korea claimed the U.S. Women's Open.
Former world number one Karrie Webb from Australia is two back with defending champion Helen Alfredsson of Sweden, American Paula Creamer and Na-Yeon Choi of South Korea.
Alfredsson, who is bidding for her fourth title at the tournament near the shores of Lake Geneva, took closer order with a four-under 68.
But current world number one Lorena Ochoa of Mexico is nine behind after a 69 to be tied for 23rd, the same mark as Michelle Wie.
Brewerton, who had to win last week to qualify for the tournament said she was getting used to rubbing shoulders with the game's elite.
"I feel like I'm getting used to it now," she told Press Association.
"This week is different pressures, but I'm thoroughly enjoying it."