Korda, who started the third round one stroke back of overnight leader Mi Jung Hur, carded seven birdies at the par-72 Miramar Golf Country Club to finish at 18-under 198, three strokes ahead of Minjee Lee, who shot a 67.
Lee briefly moved into a tie with Korda after back-to-back birdies on the 11th and 12th. But Korda quickly regained the lead with a birdie of her own on the par-5 12th.
Caroline Masson shot 66 and was in third place, four strokes behind.
Jin Young Ko, the No. 1-ranked player in the world, withdrew during the third round. She was 2 over after 10 holes and 5 over on the tournament. No immediate reason was given for her withdrawal.
Mi Jung Hur, who is looking for her third victory this season, shot a 71 and was in fourth place at 13-under 203.
Brooke Henderson, who shot a 64 on Friday, had five birdies against a pair of bogeys and a double bogey for a 71 that left her at 10-under 206.
Azahara Munoz was tied with Henderson in ninth place after a 64 that included seven birdies, an eagle and a bogey.