Five strokes ahead after a course-record 10-uner 61 on Saturday, the third-ranked Ryu closed with a 69 for a two-shot victory over fellow South Korean player Amy Yang and Thailand's Moriya Jutanugarn. "I know how to play this golf course better than anybody, just couldn't quite get the putts to fall".
The third-ranked star's sizzling round on Saturday put her in a prime position to become the first repeat victor on tour this year.
Ryu, who is coached by Australian Cameron McCormick in Dallas, leaps from from No. 3 to No. 1 on the rankings with her second win of the year.
Reid, also a rookie, birdied five of her first seven holes. She started with two birdies and two bogeys in her first five holes before steadying herself and completing her back nine blemish free.
The South Korean might add the title of "winner" to her resume well before any season-ending awards, particularly after opening the NW Arkansas Championship with an 8-under 63 on Friday.
"So, I'm just excited to be in this position and I'm just going to try to make the most of it and give my best".
"My play was best with putter today, very good", Park said.
"But I think it was great to have two weeks off, because when you have two weeks off you totally forget about how you played the last few tournaments". "Kinda felt like I was struggling a little bit coming in, so that's why the last two birdies were extremely important to me, because I kind of felt like the momentum was going the other way, so I felt like I got the momentum back and can hopefully post another good one tomorrow".
Ko, who is tied for 20th at 5 under, finished off her impressive 2016 Northwest Arkansas Championship by setting the tournament record with a 16-under 196.
Ryu, who won the year's first major at the ANA Inspiration, lies just.489 points behind top-ranked Ariya Jutanugarn, who is absent this week. "Maybe losing a playoff is not a good memory, but still, you know, close to win".