Kirk produced a round of 4-under 68 to be in a share of 21st position on the low-scoring Thornberry Creek layout.
Minjee Lee and Karrie Webb are one shot further back in 36th position after their rounds of 69, Sarah Kemp is 104th following a 73 and Sarah Jane Smith made a surprisingly poor start, shooting 75 to be 130th.
With the 36-hole cut likely to be around 3 or 4 under, there is a lot of work yet to do even for those Australians who have made a solid start.
The tournament is being led by four-time LPGA Tour winner, Sei Young Kim of South Korea, and Belgian LPGA rookie, Laura Gonzalez Escallon, that pair one ahead of Madeleine Shiels and Korean Min-G Kim.
The surprise of day one was the horror round of World Number Two, Ariya Jutanugarn, who followed her missed cut at last week’s KPMG Women’s PGA Championship with a round of 78 to be 142nd in the 144-player field.
With next week’s US Women’s Open looming large, there is concern for the gifted Thai golfer ahead of the female game’s most significant event.