Japan's Akie Iwai fired six birdies in a six-under par 66 to win the Portland Classic by four strokes and join twin sister Chisato as a first-time LPGA winner in their rookie season on the US tour.

Iwai started the day at Edgewater Country Club with a two-stroke lead and never faltered to finish with a 24-under par total of 264.

Chisato Iwai was among the golfers trying to apply pressure, charging up the leaderboard with an eight-under par 64, but it was American Gurleen Kaur who finished second after an impressive, bogey-free seven-under par 65 for 268.

Former US collegiate standout Kaur, opened with three straight birdies and had four more coming in for her career-best LPGA round.

Akie Iwai became the 10th first-time LPGA winner this season and the fifth Japanese player to triumph.

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