Starting his final round five shots clear of nearest challenger Jak Carter, Griffin had shots to work with, but made sure of the win with a clinical final round three-under 69, to finish at an unbelievable 24-under-par.

Griffin's day started with a bogey on the 1st, and as Carter birdied the 2nd, and eagled the 4th, it looked like the trophy could be in the balance.

As Carter's tee-shot found the water on 9 though, and subsequent birdie chances slid by, his chances of catching Griffin were all but gone.

Seven shots back at the beginning of Sunday’s conclusion, Queensland amateur Quinn Croker made a late charge, making three birdies on his back nine, his efforts good enough to grab a share of second with Carter at 18-under.

There was simply no catching Griffin though, with birdies at 11, 12 and 14, the Victorian stretched his lead as the amount of holes left in the day became smaller.

As he walked down the final fairway with kangaroos bounding along ahead of him, Griffin had a six shot lead, and could comfortably soak up the atmosphere as the sun set on a magical week in the Yarra Valley.

"I've had two runs of missing seven cuts and five cuts in a row, you're only human so you start to doubt whether you've still got it and you're getting a bit older." – Matt Griffin.

"It was nice to play really well through that middle stretch of the round, and those birdies on the early part of the back nine kind of took it away from everyone else," Griffin said.

The win this week marks Griffin's first since his triumph at the 2016 New Zealand Open, where a then younger player surely didn't think his next trophy would be eight years away.

"I'd had a number of wins in a short period of time, so I think that was win number probably five in about six years," he said of his 2016 win.

"It's funny, they kind of happen and then you have the big break.

"I've had two runs of missing seven cuts and five cuts in a row, you're only human so you start to doubt whether you've still got it and you're getting a bit older.

"It's a big confidence boost that I can still beat these guys, and to do it comfortably as well is even better."

After Griffin's final putt dropped, and he'd shaken hands, the first person he looked for was his young son Jack.

"Since I was a young kid watching golfers win tournaments and their kids run out, it's a dream that you have, so to have Jack be able to be here is super, super special," he said.

Carter's two-under 70, and Croker's four-under 68, were both strong closing rounds in their own right, but completely overshadowed by their playing partner.

"No, because I was marking his scorecard," Croker laughed when asked if he thought he was a chance to catch Griffin today.

RELATED: Inside Griffin's winning bag

Tied second marks amateur Croker's fifth top-15, four of them top-10s, on the Challenger PGA Tour of Australasia this season, the professional setting seeming to bring out the best in the young Queenslander.

Carter's strong week at the Heritage moves him into sixth position on the Order of Merit (OOM), but with Min Woo Lee, Adam Scott and Marc Leishman ahead of him unlikely to play the required amount of events to qualify, he essentially sits third.

"I'm coming for 'em," Carter warned to those ahead of him on the season long points race.

"Really, really happy with that, obviously.

"Looking forward to the rest of the season."

The return of the Heritage Classic to the Challenger PGA Tour of Australasia was a resounding success, and players will now doubt be looking forward to a return to The Heritage Golf and Country Club in 2025 and 2026.