South Korea's Kim In-Kyung fired a five-under 67 to stretch her lead to three shots after the second round of the LPGA Tour's Portland Classic on Friday.
Kim, whose only top 25 finish this year came at the Swinging Skirts Classic, ended 36 holes at 12-under-par 132. The last of Kim's three career wins on the USLPGA Tour came in the 2010 season.
"The greens were rolling much better in the morning, so that was kind of nice, and I hit the ball well, similar to yesterday. I'm really pleased with how I played on the par-fives," said the 26-year-old Kim.
"I'm really pleased how I played the last two days, and I'm looking forward to the weekend."
Carlota Ciganda and Hur Mi-Jung both fired seven-under 65s in the second round at the Columbia Edgewater Country Club. They moved into a share of second place at nine-under 135. They were joined there by Laura Diaz, who shot 68 in round two.
Last week's winner Ryu So-Yeon carded a 66 to move into fifth place at six under. She was joined there by Mina Harigae (69), China's Lin Xi Yu (68) and Paula Reto (69).
Amelia Lewis is alone in ninth place at seven-under 137 after posting a 71 on Friday.
Queenslander Sarah Jane Smith was the best of the Australians after a second round two-under par 72 to be in a share of 39th.
Defending champion Pettersen and US Solheim Cup captain Juli Inkster (70) are among nine players tied for 10th place.
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