There's been a South Korean blitz at RACV Royal Pines on the first day of the Australian Ladies Masters.

The top three finishers from Thursday's round include leader Bo-Mee Lee on seven-under (65), So-Yeon Ryu (66) and Hee-Kyung Seo (66), followed by a close pack within three shots of the lead.

The Herald Sun reports, a bogey on the last by rising South Australian prospect Stephanie Na (67) still left her leading the Aussie charge with Canberra's 2011 runner-up Nikki Campbell.

It's hoped overnight rain doesn't affect the course, which was partly flooded last week following a series of heavy downpours.