"I hit the ball really well and I was having a hard time judging the wind. Because it was quite subtle it was fluctuating quite a bit.
"I three-putted on my 11th hole and that kind of took the lid off my head a little bit. And then I was able to get a string of birdies, which kind of put me back into good momentum.
"Nice to finish with a birdie, but overall I thought it was a solid round.
Ko wants to focus on the small things from here.
"If I hit a good shot, great. If not, can't really do much about it. I think having the internal goal helps to put less pressure on the result stuff and just do a good job of what I can do."
Ko's efforts come just a week after another strong finish since she linked up with swing coach Sean Foley. Ko finished in a tie for second at the Gainbridge LPGA — an event she led after the first and second rounds.
That event was won by Korda, who benefited from a relaxed week ahead of her opening round.
"I took [Tuesday] off, did laundry, drove up here, got tested. But I was actually really tired. I just tried to keep it pretty simple and easy," she said.
"I worked on my swing a little just because I wasn't hitting it good. I think just being tired your swing is all over the place, so I tried to tighten up my swing. I hit it pretty solid, so hopefully I can keep improving on that the next couple days."