Kerr, who could have had the outright lead but for a bogey at the 18th, is joined by Inbee Park, who carded a five-under 65 to tie for the lead after the second round at the Royal Mayfair Golf Club.
“It’s a course where you have to really shape the ball off the tee and be creative,” said American Kerr, who won the tournament in 2006.
“I played very well the last couple of days. It’s unfortunate I bogeyed the last hole today but that’s what happens when you hit an errant shot and have to chip out to a difficult pin.
World number one Park, playing alongside Kerr, followed her opening round five birdies with seven on day two to join Kerr at the top of the leaderboard.
“I worked on a couple of things after [the Women’s Open] because I wasn’t hitting it my best,” said the South Korean, who had the chance to become the first golfer to win all four majors in a tournament year at St Andrews.
“On the greens I was really comfortable because they’re so pure wherever you hit it, it’s just going to go right there.”
Frenchwoman Karine Icher hit a four-under 66 to sit one shot off the pace in third alongside American Angela Stanford, while teenage defending champion Lydia Ko (tied for the lead overnight) is another shot back after a round of 69.
The New Zealand 16-year-old is joined by Laura Davies and Paula Creamer in fifth while England’s 17-year-old Charley Hull is a further shot adrift, alongside Kathleen Ekey, Stacy Prammanasudh and Hee Young Park, after a round of 66.
“I played pretty solid,” said Hull, one of the stars of Europe’s win over American at the Solheim Cup last weekend.
“I wasn’t hitting that good today on the front nine with my tee shots because I felt a little tired out there. The back nine I got something going, holed a few putts and I’m pretty pleased with that.”
World number two Stacy Lewis continued to struggle and recorded seven bogeys on her way to a four-over par round of 74 while fellow American Michelle Wie missed the cut with a six-over round of 76.
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