Shadoff posted seven birdies in her morning round at Royal Adelaide to hold a one-stroke lead from South Korea's Jeongeun Lee6.

Reigning US Open champion Lee6 – the numeral an addition when she became the sixth golfer with that name on the Korean Tour – made five birdies in a seven-hole stretch in the middle of her round.

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Ewart Shadoff birdied her last two holes to take the clubhouse lead from Lee6, with American duo Amy Olson and Marina Alex sharing third place at five-under.

Defending champion Nelly Korda posted four-under 69 while top-ranked Australian Minjee Lee shot three-under to be the best-placed local so far.

Fellow Australian Robyn Choi carded one-under, compatriots Katherine Kirk and Sarah Jane Smith even par, while five-time Open champion Karrie Webb, who has been battling a virus, finished one-over.

Perth's Hannah Green, who is among 15 major winners in the field, has birdied her first hole in a perfect start to her afternoon round.

- Steve Larkin, Australian Associated Press