Henderson won twice previous year, taking the KPMG Women's PGA Championship for her first major, and successfully defending her title in the Cambia Portland Classic.
The fans, she said, bring her special joy. "And going into the back nine, I just wanted to give myself as many chances as I could".
Hyo Joo Kim (65) was 12 under, and Lydia Ko (64), Michelle Wie (64), Moriya Jutanugarn (67) and Carlota Ciganda (68) followed at 11 under. "I was looking at birdie on nearly every hole, which was nice". "I just changed the irons and it's made all the difference", said Pace.
"This is definitely a great layout for my game", she said.
There are four players at 14-under, including Pace, Sung Hyun Park, Jenny Shin and Brooke Henderson.
The rains came in at Blythefield Country Club pushing the 3rd round tee times back two hour.
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Due to flooding the fifth hole was played as a par 3 instead of a par 5 with Ko picking up one of her birdies at the hole. "You know, I sometimes overthink things and I'm just trying to have more fun with my caddie in between shots and he does great with just helping me relax out there", she explained.
A three-times victor on the LPGA Tour, Henderson has recorded just one top-five finish this season.
"I kind of peeked with about five holes to go and I think it said minus 14 was leading, and then I just saw on the last minus 12 was", Thompson said. "I practiced that shot in the practice rounds and it jumped forward on the first bounce there and I don't think I got that today".
Seven players are tied at 10-under: 2014 champion Mirim Lee, Cristie Kerr, Madelene Sagstrom, Stacy Lewis, Emily Pederson, Shanshan Feng and Mi Jung Hur.
Coming off a playoff loss to Ariya Jutanugarn last week at the Manulife Classic in Cambridge, Ont., Thompson had six birdies - four on the back nine - and a bogey to reach 15-under 196.
Play will resume Sunday morning at 8:09 a.m. with the final pairings taking the course at 10:10 a.m.