Kerr finished with a 2-under 70 to match Salas at 10-under 206. After dropping a stroke on the par-5 17th, Kerr holed out from the edge of the green on the par-4 18th after taking a penalty drop.
''Obviously, it was the worst shot I could have hit and then it was the best shot I could have hit,'' Kerr said. ''So go figure, that's golf. It was pretty amazing. It is really one of those moments that you just remember for a lifetime. I was just trying to get it close. Usually that's when those go in.''
Kerr won the Kingsmill Championship last year for her 16th LPGA title.
''I hit two hooks on 17 in a row,'' Kerr said. ''That hole owes me tomorrow. That hole owes me tomorrow, big time.''
Salas, the former Southern California player from Azusa, had a 69. She birdied the par-5 17th for a share of the lead and matched Kerr with a par on the last.
Salas was followed by a spirited gallery wearing ''Team Salas'' shirts as she tries to win her first LPGA title.
''I'm just really trying to capitalize on the par 5s,'' Salas said. ''Just staying patient. That's really my key this week is to stay patient, even though I'm in trouble, like on No. 13, where I hit it into the bunker.''
She got up and down for par, and didn't let a bogey on No. 15 - her first of the tournament - bring her down.
''One bogey out of three days is not a bad thing,'' Salas said.
''Overall I handled my nerves pretty well,'' Carter said. ''It was my first time playing in the final group.''
Nordqvist and Uehara shot 67, and Feng had a 69.
''I started off really solid,'' Nordqvist said. ''I think the back nine is playing a little tougher, but I hung tough and made a silly mistake on 16. But other than that, I'm really happy with my round.''
Third-ranked Stacy Lewis was 7 under after a 73. She had two late bogeys.
DIVOTS: One of the tournament's most bizarre shots came Saturday from Yani Tseng on the par 4 No. 18. Tseng sprayed her approach shot left, deep into the bleachers hugging the green. The ball ricocheted around and spit out, landing on the green where Tseng, the 2012 winner, parred the hole. ... Michelle Wie and 16-year-old Lydia Ko were in a group tied for 28th at 3 under. Wie had a 70, and Ko shot 71.