Ko's earlier runner-up was in February at the Gainbridge LPGA, where she finished three shots behind Korda.
The 23-year-old former world No 1 has 16 LPGA victories and two majors but has slumped since her last win in 2018. However, her game began to rebound last summer when the LPGA returned from its pandemic pause. Ko had the 54-hole lead at the Marathon LPGA Classic in Ohio last July but shot a final-round 73 to finish a shot behind winner Danielle Kang.
Korda has needed only 25 putts in all three rounds this week.
"I did leave a couple out there," Korda said of her 63, "so it's kind of crazy."
Yuka Saso, a 19-year-old from the Philippines playing on a sponsor's exemption, followed her back-to-back 64s with a 71 and was four shots back. She began the day with a two-shot lead over Ko but bogeyed the first hole while Ko made birdie. Saso made three more bogeys on the front nine before rallying to finish under par for the day.
The average score today, with Kapolei less breezy and a few tees moved up, was 68.3. Among the big movers were Leona Maguire, who was five shots back after a 65, and Amy Yang, who shot 64 and was another shot behind.
With several players aiming to go low and give Ko a challenge tomorrow, the Kiwi is trying to stay relaxed.
"There is always that little added thought that, 'hey, you're in the final group'. More so when the scoring has been fairly low around this golf course, you can't really take anyone out of it.
"So I just don't think a big deal of it. I think fun and patience is going to be a big key.
"I'm just going to enjoy it and have fun out there and see how I finish at the end of the day."
- AP