Ha Na Jang reacts to her approach shot on the 18th hole during the second round of the Marathon Classic at Highland Meadows Golf Club Friday in Sylvania, Ohio.

SYLVANIA, Ohio — South Korea’s Ha Na Jang shot a 4-under 67 on Friday to increase her lead to two strokes in the suspended second round of the LPGA Tour’s Marathon Classic.

Jang had a 9-under 133 total at Highland Meadows. Winless in 23 career tour events, she capped her bogey-free round with a 12-foot birdie putt on the par-4 ninth.

South Korea’s Q Baek was second after a 67.

The start of the round was delayed 2 1/2 hours because of rain and lightning, and play was suspended for the day at 8 p.m. because of more lightning. Fifty-four players were unable to complete the round. Jang has fought through back problems that had her thinking about withdrawing before the first round.

“I think not much practice makes it easier to playing golf,” Jang said. “Not tired. Just feels really, really good. Body is a little tight, but my swing is very good.”

She had a one-hour massage after Thursday’s round and planned to do the same thing Friday.

Her success during the first two rounds has helped Jang’s confidence. She went back to South Korea to play in two tournaments and that also helped improve her confidence.

“I have a little bit more confidence in Korea,” Jang said.