Lee wasn't the only player to go on a scoring tear, with Canadian Brooke Henderson also holing out for eagle from a greenside bunker on the short par-4 17th to the delight of her large partisan gallery.
Both Lee and Henderson carded six-under 65s in the third round at the Mississaugua Golf and Country Club on Saturday to sit at 11-under 202, sharing a three-shot buffer over their nearest challengers going into the final round.
Lee chipped in for birdie on the par-4 eighth, then made a long eagle putt on the par-5 12th. She ran in an eight-footer for another eagle on the 17th, then chipped in again to save par on the par-4 18th.
"I would say those two (eagles) are my highlights and, obviously, the chip-in on the last," Lee said.
"There are no pictures on the scorecard."
Lee won the KPMG Women's PGA Championship in Texas in June for her third major title and 11th LPGA Tour title, and is currently ranked No.4 in the world.
"I think I it will just be extra exciting being in the final group with Brooke," the 29-year-old Australian said.
"I felt like I was hitting it really solid. With the score that I had, I felt like I left a few out there.
"So (I'm) just going to work a bit on my putting afterwards trying to get the speed and the line right."
Henderson, the 2018 champion at Wascana in Saskatchewan, had an eagle, six birdies and two bogeys in breezy and cloudy conditions on Saturday.
The local favourite won the last of her 13 LPGA Tour titles in January 2023.
"It's always been a really special week," Henderson said.
"I feel like I've learned so much every single year playing in it.
"I was just trying to lean back on some times when I've had a lot of success here, what I did and the mentality I had going into it."
Japan's Akie Iwai, the Portland Classic winner last week who took a three-stroke lead into the weekend, bogeyed the first three holes in a 72 to drop into a tie for third at eight under with top-ranked Jeeno Thitikul, of Thailand.
Thitikul, who shot a third-round 69, is making her first start since taking the No.1 spot in the world from American Nelly Korda.
Australian Grace Kim (71, 69, 67) is in a four-way tie for seventh place at six under.
Aphrodite Deng, a 15-year-old Canadian amateur who was tied for second after an opening 66, was also at six under after a 68.
"It's been incredible with all the people out here supporting me," Deng said.
Korda was tied for 24th at three under after a 72.
with The Associated Press
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