Harold Varner III has powered home with a wet sail to win the Australian PGA Championship, while drawcard Adam Scott finished third.

The United States' Varner was trailing Brisbane native Andrew Dodt by two strokes heading into the final round, but backed up a 5-under-par third round with a brilliant run home.

He shot a bogey-less 4-under on the front nine, while Dodt only managed one birdie in the same stretch.

Varner kept it going as he came back in, with birdies on 10, 12, 13, 15 and 17 only slightly soured by bogeys on 11 and 14.

Dodt's 3-under round was good enough for outright second, while world number seven Adam Scott carded four birdies and added an eagle on the 15th hole to pass Ashley Hall for outright third with a 5-under last 18.