Knox now holds a two-shot lead over amateur Stefan Jacobs and Kian Coetzer.

The English professional is now on 14-under-par 130 after carding a five-under-par 67 in the second round.

Knox had a flawless front nine, picking up birdies at the first, third and seventh holes for an outward 33. After the turn, he added further birdies at the 10th, 11th and 15th before dropping a shot at the 16th for an inward 34.

Jacobs and Coetzer are tied for second place on 12-under-par 132. Jacobs carded a 65 in the second round, having opened with a 67, while Coetzer followed up his opening-round 68 with a brilliant 64.

Brandon Gildenhuys sits in fourth place on 10-under-par 134, while Phillip Geerts is fifth on nine-under-par 135. Christian Kriek, Ruan Groenewald, Louis Liebenberg and Matthew Bennett share sixth place on eight-under-par 136.