JAKARTA, May 5, 2013 (AFP) - Wiesberger won his second title in Asia after totalling a 15-under-par 273 at the $750,000 Asian Tour event.
Els, the reigning Open Championship winner, settled for second after scoring 68 while the overnight leader Daisuke Kataoka of Japan was third with a round of 70 to finish on 275.
Thailand's Thongchai Jaidee was fourth after registering 69.
"I was struggling in the beginning after my birdie on one. But at the turn I got a bit of momentum going because I was confident with my ball-striking," said Wiesberger, in comments supplied by the organisers.
Els was one-over after five holes but put on a battling display with birdies on six and nine, followed by an eagle three on 12 which he putted from 30 feet from the fringe. He birdied the last to finish sole second.
"I played and fought hard. I wasn't quite at my best but had a good time," he said.
Leading final scores:
273 - Bernd Wiesberger (AUT) 67-72-67-67
274 - Ernie Els (RSA) 68-70-68-68
275 - Daisuke Kataoka (JPN) 70-69-66-70
278 - Thongchai Jaidee (THA) 69-65-75-69
280 - Angelo Que (PHI) 70-70-70-70, Ryan McCarthy (AUS) 70-70-70-70, Mo Joong-Kyung (KOR) 72-69-68-71
281 - Unho Park (AUS) 68-72-70-71, Hwang Inn-Choon (KOR) 66-74-70-71, Jake Higginbottom (AUS) 69-69-71-72, Rahil Gangjee (IND) 71-69-69-72