Karrie Webb couldn’t match her red-hot opening round at the women’s US Open on Friday, slipping down the leaderboard to sit five shots behind Amy Yang.

While the South Korean backed up a 67 with a second-round 66 to be at seven-under overall and lead the field by three shots, Webb had a day to forget at Lancaster Country Club in Pennsylvania.

Co-leader after a blistering first round of 66, back-to-back bogeys on the first and second holes weighed down Webb’s round of 72 to move to a tie for fifth at two-under.

Yang – who lived on the Gold Coast in Australia for five years from the age of 10 – rolled in four consecutive birdies on holes 11-14 to shoot to the lead.

Stacy Lewis, last year’s runner-up, and Japan’s Shiho Oyama were tied for second at 4-under.

Marina Alex, part of a three-way tie for the lead after one round, carded a 1-over 71 and was next at 3-under.

With Webb at 2-under is top-ranked and two-time champion Inbee Park (70), first-round co-leader Jane Park (72) and Michelle Pressel (70).

Defending champion Michelle Wie rebounded from an opening 72 with a 2-under 68 and was seven shots off the lead.

“I just enjoy it out here,” Yang said. “And I know the golf courses are very tough; I just enjoy the tough condition of the golf courses.”

Lewis’ patience was tested early in the first round as she struggled with four bogeys and two birdies before breaking out of her funk. That carried over into the second round and she went on a hot streak.

“I just started playing golf, is really what it was,” Lewis said, “I was thinking a lot those first 10, 11 holes, thinking a lot about my golf swing and just not playing. So I got to just playing golf … and it’s what you’re seeing in the scores.”

Inbee Park and Jane Park were two of the 55 players forced to finish their first rounds early Friday after play was suspended late Thursday when a powerful storm pounded Lancaster Country Club.