Australian golfer Grace Kim has continued her hot run with a stellar opening round at the LPGA Tour’s Portland Classic.

Fresh off two straight top-10 finishes, Kim is just one stroke behind Colombian leader Mariel Galdiano after the first round at the Columbia-Edgewater Country Club.

Playing an all-out attack, the major champion collected seven birdies and an eagle to finish the day in a seven-way tie for second.

The world number 38 also needed only 24 putts, the fewest of any player in the field.

Kim started with a three-birdie stretch after starting her round on the 10th hole.

“Having that three-birdie start is just a nice feeling to kick-start things,” the 25-year-old said.

“A lot of us out here are pretty straight, fairways and greens.

“But in terms of holing all those putts, knowing that the greens roll quite true … it’s really nice to just put a stroke on it and see where it would normally go.”

Kim is in a batch at 6-under, including Augusta National women’s amateur champion Maria Jose Marin, Arpichaya Yubol and Olivia Cowan.

The 20-year-old Marin landed five-straight birdies on the front nine.

“I reached a flow state that I haven’t reached in a while,” she said.

“After the British Open I didn’t play my best golf, and I think getting that confidence back with this round is all that I needed.”

One shot behind them and tied for ninth is Australian Robyn Choi (67), who sprang to life on the back nine.

After going out in even par with a birdie and bogey, Choi stormed home with four consecutive birdies beginning on the 12th. She then added another on the 17th to rocket up the field.

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Fellow Australian Steph Kyriacou (72) had a solid round of even par, but will have to play well with the cut projected to be around 1-under.

American pacesetter Galdiano’s opening 65 featured nine birdies.

Galdiano, a 28-year-old from Hawaii, is making her fourth LPGA Tour start of the year.

“Every start on the LPGA means a lot to me, so just enjoy the moment, really,” she said.

AAP