Su Oh heads the Australian charge at the LPGA Classic in Grand Rapids, but faces a big challenge with several in-form stars lurking at the top of the leaderboard.
Canadian teenager Brooke Henderson fired an eight-under 63 in the first round on Thursday to sit alone on top, but included in a six-way tie one shot behind are fellow major winners Lexi Thompson, Shanshan Feng and Stacy Lewis.
Oh carded a four-under 67 to be among a group of 12 players in a tie for 13th.
One shot further behind is Australia's seven-time major winner Karrie Webb, with compatriots Sarah Jane Smith (two under) and Sarah Kemp and Katherine Kirk, both on one under.
The 19-year-old Henderson eagled the par-five eighth hole and had six birdies in her bogey-free round at Blythefield.
She won the major KPMG Women's PGA Championship last year and has three tour victories.
"I felt great from the start," Henderson told reporters.
"Everything was going my way. I was hitting the ball really well and some putts were dropping, which (was) kind of a change from the past few weeks.
"I had a really good feeling and made a lot of birdies, a lot of putts. I feel my game is in a really good place."
Kiwi Lydia Ko, who lost her at No. 1 ranking in the world after an 85-week run at the top, returned from a three-week layoff to post a six-under-par 65 to be joint eighth.
New world No. 1 Ariya Jutanugarn opened with a two-under 69. She won the LPGA Classic on Sunday in Canada in a playoff with Thompson and In Gee Chun.
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