Beatriz Recari drove to the green on the 285-yard 16th hole to set up a 4-foot eagle putt and finished with a 3-under 69 on Saturday for a two-stroke lead in the Kia Classic.
Recari, the 25-year-old Spaniard who won her lone LPGA Tour title in 2010, had an 11-under 205 total at Aviara Golf Club.
Webb was second after a 70. Winless since the 2011 Founders Cup in Phoenix, Webb dropped strokes with bogeys on Nos. 13 and 17.
Paula Creamer and I.K. Kim were three shots back. Creamer had a 71, and Kim shot 70.
Stacy Lewis, playing her first event since taking the No. 1 spot in the world from Yani Tseng with a victory last week in Phoenix, was four strokes back after a 69.