Jazz, who extended his overnight two-shot lead to five after sinking three birdies in his opening seven holes, overcame a wild triple-bogey on the par-4 11th hole and a bogey on 14 to become the first foreign winner of the prestigious event since American Rickie Fowler in 2011.

The 23-year-old Jazz signed for a closing one-over-par 72 to win by one shot over Korea’s Innchoon Hwang with a six-under-par 278 total in the KRW1,200 million (approximately US$1,067,000) event, co-sanctioned by the Asian Tour and the Korea Golf Association (KGA).

“I’m really honoured to win the national Open of Korea,” Janewattananond said.

“This is a really tough course. I got away with most of it but still struggled towards the end. I got off to a good start today and I was like flying until that triple-bogey.”

RIGHT: Zach Murray was the best of the Australians, finishing T24th. PHOTO: Lintao Zhang/Getty Images. Top: Korea Golf Association.

Despite missing out on his second Asian Tour victory, Hwang took pride in his runner-up result, which not only marked his best finish in his National Open but also earned him a coveted spot at the Open next month where he will be making his major debut.

He will be heading to Royal Portrush with compatriot Dongkyu Jang, who closed with a 72 to finish tied-fourth in the event, which offered two spots to the Open to the leading two players (not otherwise exempt) finishing in the top-eight and ties as part of The Open Qualifying Series.

American Chan Kim, who played on a sponsor’s invitation, marked his best efforts of the week with a closing 68 to settle two shots back of Jazz in third place, while Korea’s Minjoon Kim matched his final round efforts to grab a share of fourth on 281.

The second qualifying spot went to Jang as he is ranked higher than Kim on the Official World Golf Ranking (OWGR).

Zach Murray was the best of the Australians, finishing T24th.