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"Last week I won, but it's already in the past," said Iwai. "That's why I changed my mindset, to have good focus this week."

Iwai's back-to-back birdies to finish her round helped her leap over a cluster of players that held the lead for most of the day. Canadian amateur Aphrodite Deng, Mexico's Gaby Lopez, and Megan Khang shared the clubhouse lead at 5 under after the morning wave.

"I was able to have good focus and my swing had good tempo," said Iwai. "That's why I had so many birdie chances."

World No. 1 Jeeno Thitikul of Thailand and Ireland's Leona Maguire also had 5-under 66 rounds in the afternoon wave to join the group tied for second. It was Thitikul's first round of competitive golf since claiming the top spot in the women's world golf rankings, supplanting American Nelly Korda.

"It was just like another day at work for me, but then I think I will be excited and a lot of nerves out there as well," said Thitikul. "I'm not going to lie saying I'm not thinking about that, but like to be honest I just told myself that I can think about it, that I can worry, that I can have nerves.

"But at the end of the day, you've got to pass this as well. It's just another step of my life."

Khang's only LPGA Tour win came at the Women's Open in 2023 when Vancouver's Shaughnessy Golf & Country Club hosted the national women's golf championship. She said that although the tournament is in a different location, she still feels pressure to repeat at the only LPGA Tour event in Canada.

"It's always nerve-racking coming back to a tournament you have won," she said. "Obviously you would like to do it again. It's definitely a little cool coming in and still seeing some spots where my face is displayed. It still catches me off guard.

"I try to just stay the same Megan throughout golf and off the golf course."

Brooke Henderson of Smiths Falls, Ont., the top ranked Canadian on the LPGA Tour, recovered from a frustrating start with three birdies on her final seven holes to finish the day at even par, tied for 38th.

"It was a really unfortunate start that I had, and it was really tough to come back from that," said Henderson, who was in the marquee group with Thitikul. "But I feel like (caddie and sister) Britt and I, we stayed really gritty and kind of grinded it out.

"Just grateful we were able to get it back to even. I feel like lots of good things going into tomorrow, so just try to keep the momentum going."

This report by °µÍø½ûÇø was first published Aug. 21, 2025.

Note to readers:This is a corrected story. A previous version had Iwai at 6 under, instead of 7 under.