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I just walking towards (the green) and it's going in. So it was so happy and surprise there."
A victory on Sunday would make Ryu a double major winner this season alongside Nelly Korda.
This milestone comes shortly after Ryu returned from minor back surgery following the Kroger Queen City Championship.
"That is amazing, amazing dream," said Ryu.
"So I just want that one to come true, but we have one more day and Aki is pretty good player and everybody is so good player, so I just doing pretty well."
Iwai enters the final round trailing by three shots after recording 21 birdies throughout the week.
The Japanese player missed the cut at the tournament last year and expressed confidence regarding her positioning for Sunday's final round.
"Last year I missed the cut, and so I want revenge," said Iwai. "Really optimistic tomorrow.
I just keep going."
Behind the top two leaders, Brooke Henderson sits seven shots off the pace after a third-round 64, tied with Japan's Mao Saigo who shot a 67.
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Overnight leader Lottie Woad of England dropped nine shots behind Ryu after finishing Saturday with a 1-over par 72.
