South Africa's Trevor Fisher Jr recorded a third-round 63 to take a two-shot advantage into the final day of the Africa Open.
The world number 21 hit seven birdies and an eagle to replace long-time leader Matt Ford at the top of the leaderboard in East London.
The Englishman remains in contention after a 69 on Saturday, but he will have to chase down the leader if he is to win his first European Tour title.
Jaco van Zyl lies in third position, four shots adrift of Fisher Jr, while a group of four players, including Denmark's Morten Orum Madsen, are six off the pace.
