She sits two shots ahead of Japan's Ai Suzuki, with Ko in a clump of big names hoping to go low tomorrow afternoon and claim a top-five finish.
In Europe, Ryan Fox has moved up the leaderboard at the Turkish Open. After starting his tournament with a two-over 73, he bounced back with a three-under 68 to jump up 21 spots into a tie for 38th at one-under, 13 shots off the lead held by Belgium's Nicolas Colsaerts.
Fox has struggled recently, failing to record a top 35 finish in his last five events and missing three cuts, but a strong weekend will give him confidence before the lucrative season-ending Race to Dubai next fortnight.
While Fox is currently the only Kiwi on the European Tour, three countrymen are currently on a quest to change that fact.
Luke Toomey, Mathew Perry and Josh Geary are all currently playing at the second qualifying stage of European Tour Qualifying School; held across four different courses in Spain.
Just a select few will qualify for the final stage, with Geary currently the best positioned after the respective opening rounds.
Geary is in a tie for 14th in Alicante, after shooting a four-under 67. Toomey is four shots further back at the same tournament, tied for 44th.
Perry is playing in Castellon, and recorded a nice three-under 69 to sit in a share of 20th.