Star striker Kenny Athiu scored the only goal of the game early in the second half for the NPL Victoria side. 

It was enough for Heidelberg to seal the famous victory at Olympic Village, but they were by far the dominant side throughout the Round of 32 clash. 

And Heidelberg skipper Luke Byles believes it could have been a bigger margin in the end. 

“We’ve kept a lot of clean sheets this year and with the likes of Kenny [Athiu] Adrian [Zahra] and Sean [Ellis] going forward we knew we’d get a goal,” Byles told Fox Sports.

“We knew if we kept a clean sheet at the back we’d have every chance of a win. 

"And you can see tonight, it could’ve been two, three or four nil.

“But 1-0 will do!”

Almost 3000 fans braved the chilly weather in Melbourne's north to witness the famous night for the former NSL club.

“There was no pressure on us. We’re sitting top of the [league] ladder so why not go for it," Byles added.

“They are three weeks into their pre-season and it’s a long flight from Perth. And to be honest, I fancied us from the get-go.

“And Kenny took his goal really well.”