Starting the day with a two-stroke advantage over Meg Mallon, Davies never lost the lead.
Duval, whose 65 on Thursday gave him a two-stroke advantage after the first round, lost a shot on his first hole yesterday with a bogey.
Nelson and Mangrum were playing together, and Nelson had a two-stroke advantage with three holes remaining.
She birdied No. 7 to open a two-stroke advantage.
If you have ever used a chainsaw or a weed-wacker with a two stroke engine, you have experienced the two-stroke advantage.
Chalmers began the day two shots behind overnight leader Senden but reeled off three birdies in his first seven holes to take a two-stroke advantage.
Woods birdied No. 14, but at the same time Waldorf was making birdie on No. 15, keeping a two-stroke advantage.
In matching her career-best round, Golden took a two-stroke advantage over eight players.
Ritzman had a two-stroke advantage over Lopez early in the second round of the 54-hole, $250,000 tournament.
On the third hole, he lost the two-stroke advantage with which he entered the final round when he skied a 3-wood that drifted into the water.