The 52-year-old fired a six-under-par 65 to vault into a five-way share of the first-round lead at the Meijer LPGA Classic in Michigan.
Davies has not won an LPGA event since 2001 and acknowledges she does not have a good enough short game to compete on a regular basis these days.
"There's room for the likes of myself and Juli Inkster and a few of the other old girls to show what we can still do because we all hit it well," Davies said after her round on the Blythefield course in Grand Rapids.
"It's just the short game separates the top players from the ones that are just struggling a little bit sometimes."
Davies shares the lead with a group including defending champion Lexi Thompson, who parred her first nine holes, before jump-starting her round with an eagle at the par-five first (her 10th hole), where she holed out from 72 yards.