Harding made three birdies in the first four holes and birdied three of the final four to finish 13-under par, ahead of nine other players who finished 11 under.

South Korea's Choi Jinho ended the final round with a stunning eight-under-par 64 but could not reel in Harding.

"It was nerve-wracking, especially coming off. It's a situation I haven't really been in," said Harding, who bogeyed the 6th and 7th holes.

"I didn't enjoy it but it's good fun, I'm glad it happened and now we move on. I'm looking forward to seeing what happens going forward and playing in some bigger events."

RIGHT: Nick Cullen (T14) was the best of the Aussies in Qatar. PHOTO: Warren Little/Getty Images.

England's Oliver Wilson, who had a one-shot lead after the third round on Saturday, also finished tied for second place, two strokes behind.

Others who finished tied for second in the closely-fought event included Harding's compatriots George Coetzee, Erik Van Rooyen and Christiaan Bezuidenhout, Spaniards Nacho Elvira and Jorge Campillo, Swede Anton Karlsson and Frenchman Mike Lorenzo-Vera.

Harding is the fifth South African to win the event after Darren Fichardt, Ernie Els and Retief Goosen plus Branden Grace, who won back-to-back titles in 2015 and 2016.

South Australian Nick Cullen (72) was the best of the Aussies, finishing tied 14th, while newly-minted professional Min Woo Lee (73) shared 20th place.