South Korea's Jin Young Ko shot a three-under 69 yesterday to win the rain-shortened Cambia Portland Classic by four shots.
Ko finished at 11-under 205, four shots clear of South Korea's Jeongeun Lee and Australia's Su Oh. Both golfers shot 69 Sunday.
A closing 75 saw Olivia Mehaffey slip back to a share of 44th place on four over par.
The event was shortened to 54 holes after Saturday's third round at OregonGolf Club at West Linn, Oregon, was washed out due to heavy rain.
The 26-year-old Ko shot a bogey-free round on Sunday to win her ninth career LPGA event. It was her first tour appearance since the Tokyo Olympics.
Perrine Delacour of France carded a 69 to finish fourth with a 5-under 211. Thailand's Patty Tavatanakit (69 on Sunday), Germany's Esther Henseleit (70)and Spain's Carlota Ciganda (73) tied for fifth at 4 under.
Americans Jennifer Kupcho (68) and Jennifer Song (68), South Africa's Ashleigh Buhai (69), Netherland's Anne van Dam (71), South Korea's Jeongeun Lee6 (73),Thailand's Pajaree Anannarukarn (73) and Scotland's Gemma Dryburgh (76) tied for eighth at three-under.
Dryburgh had been in second place after 36 holes, one shot behind Ko.
Meanwhile, on the PGA Tour, Max Homa shot a 7-under-par 65 - his second 65 in as many days - to win the Fortinet Championship in Napa, California by a stroke over Maverick McNealy.
It was Homa's second PGA win in 2021, and both came in California. Homa, 30, previously won at the Genesis Invitational in Los Angeles in February. Prior to 2021, Homa also won the Wells Fargo Championship in 2019.
Trailing by three strokes, the 30-year-old scored a two-shot eagle on 12 and then recorded three more birdies on the next five holes to claim the lead. A par 5 on 18 was good enough to secure the win.
Overall, Homa notched six birdies, the eagle and one bogie for the win.
McNealy had held or tied for the lead the previous two rounds, and his four-under 68 Sunday was good enough for eighth-best in the field.
Chile's Mito Pereira finished third at 16 under with his own final-round 68.Australia's Marc Leishman and Talor Gooch tied for fourth at 15 under.
A five-way tie for sixth place rounded out the top ten. Japan's Hideki Matsuyama, Chinese Taipei's C.T. Pan, Patrick Rodgers, John Augenstein and Scott Stallings all finished at 13 under.
Jim Knous, who had shot a 7-under 65 Saturday to tie for the overall lead, shot a final-round 74 and finished tied for 11th.
