"I feel like I played pretty solid again," said Ko.
"It's definitely nice to get off to a good start. Kind of sets the pace for the day.
"I had a spell of pars where I couldn't really make anything going, but after a mistake I felt like I was able to kind of get back on track pretty soon after."
Like in her second round, Ko had some bad luck on the back nine but stayed positive and quickly bounced back.
"I hit a poor drive that was in like this tractor mark inside the bunker, so I pretty much had no shot. And had a very poor third shot again.
"After that I said, 'hey, there are still lots of birdie opportunities', so I felt like I tried to take advantage of that."
Ko's playing partner, Lopez, also spoke to the Kiwi's positive attitude.
"This is my fourth time playing with Lydia this year, and I've seen the progress I've made mentally and emotionally playing with her.
"It's great. I love playing with her. She transmits a lot of calmness, presence, and, yeah, I think I just fed off that. She's one of my favourite players to play with on moving day."