Karrie Webb wound back the clock with a five-under 67 to be four under at the Canadian Women's Open but it wasn't enough to go with runaway leader Ariya Jutanugarn of Thailand.
Jutanugarn had five birdies in a six-hole stretch and shot an eight-under 64 on Friday to take a three-stroke lead in the event.
A week after withdrawing from the Rio Olympics because of a left knee injury, the 20-year-old Thai star played 20 holes Friday at Priddis Greens.
She bogeyed the par-5 18th for a 68 in the completion of the delayed first round, then made eight birdies in her bogey-free second round.
"I just had to rest and take care of my knee," Jutanugarn said.
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"After that, I feel like just play golf. It didn't feel like anything changed."
South Korea's In Gee Chun and Northern Ireland's Stephanie Meadow were tied for second. Chun closed birdie-eagle for a 67. Meadow had a 69.
Three-time champion, New Zealand's Lydia Ko was four strokes back at eight under.
"I played pretty solid the last few days," Ko said.
"Hoped for a few more putts to drop, but it's just really tough out there with some pins being tucked and on little slopes. ... There's still a lot of golf to be played."
In the event before the Olympics, Jutanugarn won the Women's British Open for her fourth victory of the year.
She won three straight tournaments in May, and shares the tour victory lead with the top-ranked Ko with four.
While Webb impressed in her round, making six birdies and one bogey she doesn't yet head the Aussies.
That honour falls to the ever consistent Minjee Lee who followed up her opening round 69 with a two-under-par 70 to be seven shots off the pace at five-under.
Sarah Jane Smith and Su Oh are the other Australians to make the cut and are both at three under.
Sarah Kemp and Katherine Kirk both miss out on playing at the weekend.
