Knox holds a two-shot advantage over Daniel Smith following an impressive opening round.

On his front nine, Knox picked up birdies at the second, third, fourth and fifth holes before adding another at the seventh to make the turn in 31.

He continued his fine form on the back nine, recording three consecutive birdies at the 10th, 11th and 12th before adding another at the 15th to come home in 32.

Second-placed Smith carded a near-flawless 65, featuring an eagle at the 16th and birdies at the third, fourth, seventh, eighth, ninth and 15th, while dropping a single shot at the 16th.

Brandon Gildenhuys and Philip Geerts share third place on six-under-par 66. Amateur Stefan Jacobs, Hannes Strooh and Ryan Groenewald are tied for fifth place on five-under-par 67.