The Dane won his first European Tour title in South Africa
JB Hansen Wins Maiden European Tour Title At Joburg Open
Hansen played the final nine holes in three under to Nienaber's two over.
It is Hansen's first European Tour victory after turning professional a decade ago.
Related: JB Hansen What's in the bag?
"It's quite emotional," Hansen said whilst holding back tears.
"This is what we work for, you know? The family watching back home.
"Wilco got in front quite quick, by three shots, and we managed to stick to our game and our plan.
"He's long, he's got some good things with the game hitting it very far and very straight so we knew we had to go out and do our own and do the things we've done the first three days. We succeeded pretty well today.
"I putted really well, almost haven't missed a putt inside six feet and holed a lot of long ones as well."
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