Ko will look to take her strong run of form into the Women's PGA Championship, the third major of the year, which takes place in a fortnight.
"Week in, week out you try and play consistently. I guess that's the goal. It is hard. I think the level of play and the level of talent on tour is really high, so to continuously play well and to win I think makes it extra difficult.
"But I'm trying to focus on my game and see what else I can do better and kind of take it day by day."
Meanwhile, Danny Lee had his third top 10 finish of the season after shooting 65 in the final round of the Canadian Open.
Lee finished at nine-under in a share of 10th spot to earn US$237,000. Rory McIlroy won the event at 19-under on the back of a final round 62, for his 21st victory on the PGA Tour.
Englishman Justin Rose flirted with a 59 before a bogey on the 18th hole saw him card a 10-under 60.
In Europe, Kiwi Daniel Hillier finished fifth at the Empordà Challenge on the Challenge Tour. Hillier shot a final round 66 for his best finish since February.