Yani Tseng and Na Yeon-choi held a share of the lead at the Hana Bank KOLON Championship after the second round in Incheon.

Tseng of Chinese Taipei, who is chasing her third LPGA Tour victory, made a fine start to her round with three birdies before bogeying the ninth and then making par coming home for a two-under 70.

South Korean Na, meanwhile, carded four birdies on the front nine but bogeys on the 13th, 15th and 17th meant she had to settle for a one-under 71 and a share of the lead.

The pair have a two-day total of five-under 139 and a one-shot advantage over Maria Hjorth (72) and Jimin Kang (73).

World number one Lorena Ochoa endured a torrid round in which she carded two double bogeys and returned to the clubhouse with a five-over 77 that left her 10 shots off the pace.