Oh started Sunday four shots off the pace and that's where she wound up at the end of play, with Jin Young Ko securing her second victory in her last three Tour starts.

Making her first start since the Tokyo Olympics, the second-ranked South Korean Ko closed with a three-under 69 at Oregon Golf Club to get to 11-under 205.

Oh and Jeongeun Lee6 both carded rounds of 69 to go from joint fourth to a share of second at seven-under.

After a bogey start, Oh birdied the 4th and 7th holes before back-to-back birdies on 16 and 17.

The 25-year-old twice shared second place in 2019 as she continues her quest for a maiden LPGA title.

Play was washed out in Portland on Saturday because of rain and the event was cut from 72 to 54 holes.

RIGHT: Jin Young Ko claimed a second win from her last three starts on the LPGA Tour. PHOTO: Steve Dykes/Getty Images.

Frenchwoman Perrine Delacour was fourth at five-under after a 69.

Gemma Dryburgh, a stroke behind Ko entering the final round, had a 76 to drop into a tie for eighth at three-under.

The tournament was shifted from Edgewater Country Club to Oregon Golf Club in June because of safety concerns.