Megan Khang has shot a third-straight six under 66 and is on track to win on the LPGA Tour for a second straight week, taking a one-shot lead into the final round of the Portland Classic.
The 25-year-old American closed her third round with an 18-foot birdie putt on Saturday to get to 18 under.
She has carried on her hot form after winning the CPKC Women's Open at Shaughnessy in Vancouver, British Columbia, in a playoff six days ago for her first LPGA Tour victory after 190 starts.
"I think last week definitely helped build some confidence, knowing I can win out here," said Khang.
"It's not just if it was going to happen or when, but like it has happened, so it's definitely a great feeling to have under the belt."
Hyo Joon Jang of South Korea and Monday qualifier Chanettee Wannasaen of Thailand were tied for second.
The 20-year-old Jang, ranked 488th in the world, shot a 62. She had 11 birdies and one bogey.
Nineteen-year-old Wannasaen, ranked 367th, had a 65. She has missed nine straight cuts in LPGA Tour play but lost a playoff to Yue Ren last week in Idaho in the Epson Tour's Circling Raven Championship.
Carlota Ciganda of Spain was fourth at 15 under after a 66. Xiyu Lin (66) was at 14 under with Atthaya Thitikul (67), Ruoning Yin (68) and Gina Kim (68).
Australian rookie Grace Kim improved with a 67 to be in a group tied for 23rd at 10 under along with countrywoman Sarah Kemp (69).
"I wasn't really counting birdies," Jang said. "I was more focusing on the present."
Khang played the back nine in 5-under 31.