South African Norris, who carded a remarkable 62 on Friday, held a four-shot lead going into the fourth round on Sunday but bogeyed two of the first four holes and was caught on the back nine by compatriot Dean Burmester.

Fortunes swung, however, when Burmester carded a double-bogey six on the par-4 17th, and with his birdie on the same hole, Norris claimed victory by three shots.

"I stayed patient and kept my head, and eventually things fell into place. I was hitting the ball nicely and I gave myself chances. Things started going my way," a tearful Norris told reporters.

West Australian Jason Scrivener finished joint 64th following a 73 in which he dropped four shots over the final four holes.

His compatriot Maverick Antcliff finished alongside him on six-under after a 72.