Louis Oosthuizen won the Africa Open by two shots from fellow South African Tjaart van der Walt in East London yesterday.
The two players shared the overnight lead, but a sparkling six-under-par round of 67 eased the defending champion Oosthuizen to the title.
The 2010 British Open winner birdied the par-three 17th, Van der Walt making bogey at the same hole, to settle the tussle.
Oosthuizen shot an eagle, six birdies and two bogeys to finish with a four-round total of 27-under.
Retief Goosen finished in third, three shots off the lead on 24-under, after he carded a 69.
Goosen shot a birdie and an eagle in his opening three holes, but his challenge faded and he picked up just two more birdies and a bogey.
A fourth South African, Jaco van Zyl, finished fourth on 23-under, while Scotland's Alastair Forsyth was fifth, one shot further back after a closing round of 67.
Oosthuizen said he knew his final-round battle with Van der Walt would not be easy.
"It was a real dogfight," he said.
"I remember watching Tjaart when I was an amateur, and it was just great seeing him play to his potential today. He played really well."
Ireland's two entrants both missed the cut heading into the weekend. Simon Thornton was denied by just one shot after he bogeyed the ninth, his final hole, in a level-par 73, on Friday, while Damien McGrane exited on level par after a one-under 72.