Jutanugarn, who carded six birdies and two bogeys in the round, is 16 under for the tournament, one shot ahead of South Koreans Mi Jung Hur and Jeongeun Lee6. Only four holes into the Aberdeen Standard Investments Ladies Scottish Open on Thursday, the Korean needed the calming influence of Gary Marshall.
Hur, who started on No. 10, made only one par over her first 12 holes.
Hur's last LPGA victory came at the 2014 LPGA Classic, having won her maiden title five years before in the Safeway Classic.
"That was raining like today but also a wind blowing 25 to 30 miles per hour", she said. She's a newcomer to links golf. The wind wasn't up too badly when I finished, so it was not so bad. The 25-year-old is once again paired with Hur tomorrow and joined by 2019 U.S Open victor Jeongeun Lee6 in the final group at 11.10am.
She picked up a check for $225,000. "I had a really short third shot, left the putt really short but then rolled in the next one from 30 feet".
"I'm just trying to play my game and have fun out there", Jutanugarn said.
Carly Booth, the 2012 victor, finished as leading Scot in joint-ninth after a closing 71 for 274.
Low round of the day belonged to Australian 23-year-old Minjee Lee, who went bogey free in a round of 64 (-7).
Scotland's Carly Booth, who posted a flawless round of 66 (-5), has shown signs of being back to her best form this year and today's impressive display will provide the local gallery with a welcome home-grown talent to support tomorrow.
After a damaging 81 on Saturday, Kylie Henry bounced back with a gutsy 66 to finish joint 50th on level-par.
Mi Jung, visible for probably miles away even through the rain in a bright lime green rainsuit, didn't even look at the scoreboards so was unaware she was tied with three others at the turn.
"I got a really lucky draw for this week".
In her first outing since December 2017, Pamela Pretswell Asher ended up 70th after a last-day 80 for a 10-over total.