The 23-year-old duly produced a bogey-free 67 to claim his first Sunshine Tour title.
Two shots off the lead and having never won on the main tour before, Brown also had to conquer one of the longest courses in the world and multiple winners like Ulrich van den Berg, Trevor Fisher Jr and Neil Schietekat.
A blustery, shifting wind was an added challenge.
But Brown showed remarkable composure and tremendous skill as he compiled one of the few bogey-free rounds all week and collected five birdies as well to finish on 12-under-par.
“They say your first one is the hardest to win and it was definitely very difficult today, but that was one of the best rounds of my life. It was breezy and difficult to choose the right club for these pin positions.
“But my ball-striking was amazing today, I hit all 18 greens in regulation, which is wonderful on the third-longest course in the world,” Brown said.
“My putting was also solid and if you keep the bogeys off your card on an amazing course like this, then you’re going to be tough to beat. I definitely had to stay patient, you might feel like you should be making more birdies, but it’s not that easy on this course. I tried not to look at what the others were doing.”
The leading three-ball of Fisher, van den Berg and Albertse all birdied the par-five first hole, but they were then jerked back to reality as the rest of the final round became a struggle.
A double-bogey on the par-five seventh was a fatal blow for overnight leader Albertse, while van den Berg double-bogeyed the par-four 12th and dropped four more shots coming home in 43.
Fisher had three successive bogeys on the treacherous stretch of long par-fours from 14 to 16 and closed with a double-bogey seven at the 18th.
Schietekat was moving in the other direction; however, and birdies on the last two holes gave him a 67 and the clubhouse lead on 10-under-par.
Keagan Thomas fired a 69 to finish third on nine-under, while Anton Haig and Albertse tied for fourth on eight-under.
