BELMONT, Mich. — Inbee Park took the second-round lead Friday in the Meijer LPGA Classic, birdieing her first three holes en route to her second straight 5-under 66.

Park finished on the front nine, adding birdies on the par-5 fifth and eighth holes in her bogey-free round at Blythefield Country Club. The third-ranked South Korean player won six times last year and took the Manulife Financial in June in Canada for her 10th LPGA Tour title.

“My putting feels like I’m back to last year,” Park said. “Hopefully, I can hole some more putts the next two days.”

After using a mallet putter since 2008, Park tried a friend’s blade putter Tuesday and started making putts. She hasn’t stopped since with 27 putts in each round after having TaylorMade quickly make her an identical version.

“I just never used that style of putter for a long, long time and I just wanted to have a change because I tried everything else and it didn’t really work,” she said. “This was pretty much my last option.”

She said the improved putting was especially obvious in the second round.

“Yesterday I hit a lot of the shots closer, but today I made 15 to 20-footers, at least a couple of them,” she said.

Fourth-ranked Suzann Pettersen was a stroke back. The Norwegian player matched the course record with a 64.

South Korea’s Mirim Lee also shot 64 to reach 8 under.

South Korea’s Amy Yang was fourth at 7 under after a 67.

Second-ranked Lydia Ko, the 17-year-old New Zealand player coming off a victory in the Marathon Classic in Sylvania, Ohio, was tied for fifth at 5 under after a 68. Germany’s Sandra Gal, the first-round leader, also was in the group at 5 under, following her opening 65 with a 72.

Top-ranked Stacy Lewis was even-par after a 72.

Women’s British Open winner Mo Martin Mo Martin withdrew Friday morning because of a thumb injury. It was unclear if she will play next week in the LPGA Championship.

U.S. Women’s Open champion Michelle Wie withdrew after nine holes Thursday because of a wrist injury.