The Western Australian carded 23-under-par to lift the Brodie Breeze Trophy and be crowned the 104th champion.
Peake has a remarkable back story, including being a Rebels bikie gang member and was sentenced to five years in prison in 2014 for a serious assault when he was 21.
The left-hander, who weighed 130kg during his time in prison, turned his life around through golf on his release.
The 31-year-old fist pumped to the bumper crowd packed around the green in a wave of emotion at his first victory.
Jack Thompson, of Australia, Japanese golfer Kazuki Higa and South African Ian Snyman all carded 22-under-par and had a nervous wait for Peake’s final hole.
Heading into the 18th, Peake sat at 23-under-par and just needed to line up his final putt perfectly – and he did just that.
More in tomorrow’s Otago Daily Times.
