Ryggs Johnston, a 24-year-old from Montana making his second DP World Tour start, was just as shocked as anyone that he won the ISPS Handa Australian Open.

Johnston, an unheralded American player, celebrated his first professional victory Sunday with a three-stroke triumph in the Australian Open, while South Korea's Jiyai Shin became a two-time winner of the Women's Australian Open, which was played concurrently at two courses on the famed Melbourne Sandbelt.

Already exhausted from three stages of DP World Tour Q-School and last week’s season-opening Australian PGA, Johnston wasn’t afforded a practice round on Kingston Heath, site of the Aussie’s national open and only Johnston’s second career start as a DPWT member, because of inclement weather.

Unheralded American Ryggs Johnston won his first professional title Sunday by closing with a 4-under 68 at Kingston Heath for a three-shot victory in the Australian Open. The Arizona State alum was among three players to earn a spot in the British Open.

Unheralded American Ryggs Johnston can barely believe the company he's now in after crashing the party with a stunning and most improbable Australian Open triumph in Melbourne.

American rookie Ryggs Johnston and former world number one Shin Ji-yai win the men's and women's Australian Open titles.