Australian golfer Matthew Griffin wins the OneAsia Tour event in South Korea

AUSTRALIAN Matthew Griffin scored the biggest win of his career with victory at the OneAsia Tour event in South Korea.

Matthew Griffin

AUSTRALIAN Matthew Griffin scored the biggest win of his career on Sunday with a one-stroke victory at the OneAsia Tour event in South Korea.

The 29-year-old from Melbourne led by two strokes heading into the final round and held his nerve with an even-par 72 to take him to nine-under for the tournament.

Griffin beat home South Koreans Kang Kyung-nam (68) and Park Sang-Hyun (71) to collect the $US178,000 ($A173,800) winner's cheque at the hilly course in Gangwon-do province.

Kim Bi-o, winner of two events on the OneAsia circuit already this year, was a shot further back.

Australian Aaron Townsend (72) finished at six-under in a tie for sixth and compatriot David McKenzie was three shots further back.

"I am really, really thrilled," said Griffin, who was once ranked the third-best amateur in the world.

"This is what I have worked for all my life, so it is absolutely amazing to finally get there."

Griffin only scored his first four-round victory at the South Pacific Open in New Caledonia last year.

The win gives him a two-year exemption on the OneAsia Tour and puts him in good stead to tackle qualifying school on the US PGA Tour at the end of the year.