Davidson was granted the final spot in the 156-player field for the second women's major of 2026, with play getting underway at the iconic Riviera Country Club in Los Angeles on Thursday.
The Scotland-born Queenslander placed joint third at a qualifying event in Seattle in late April, making her the first alternate.
The winner of the ShopRite PGA last Sunday earned an Open start but with France's Celine Boutier already exempt, that spot went to Davidson.
It will be her third major, playing the PGA Championship in 2025 and the 2026 Chevron Championship in April when she tied for 67th.
The 27-year-old joins a six-strong Australian contingent including three major winners - Hannah Green, Minjee Lee and Grace Kim - as well as Sydney's Stephanie Kyriacou.
Davidson will make her Open debut along with Sarah Hammett, a 19-year-old amateur who played her way into her first LPGA major by finishing as a medallist at qualifying in Arizona.
Hammett is also from the Gold Coast and attends the University of Southern California.
Four of the six Aussies in the field are staying together with Green, Kim, Kyriacou and Davidson all bunking in together while chasing major championship glory.
"Hopefully we'll actually see one another," Green said.
"Sometimes during major weeks, you barely see one another just because everyone's got different routines or schedules for the day."
Fresh off a two-week break at home and with four wins to her name already this season, West Australian Green will lead the Aussie charge in the US state where she has enjoyed the most success.
A three-time winner of the JM Eagle LA Championship - including the 2026 edition in May - Green enters the week ranked world No.5 and is looking to add to her 2019 KPMG Women's PGA Championship triumph.
Lee won the Open tournament in 2022, her second of three majors, when it was played at Pine Needles in North Carolina, running away with a four-stroke victory.
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