Home favourite Brandon Stone was still the man to catch as he reached the turn on day four of the Alfred Dunhill Championship.
Overnight leader Stone sat two shots clear of nearest challenger Charl Schwartzel after carding two birdies and a bogey in his first nine holes on Sunday.
Stone was briefly joined at the top of the leaderboard by defending champion Schwartzel after the 32 year old picked up three shots in his first six holes to get to 17 under.
But, after safely parring his opening five holes, Stone made his first gain of the day at the sixth to regain the outright lead.
With Schwartzel dropping a shot at the seventh and Stone rolling in his 15 foot birdie putt at the same hole, the 2016 BMW SA Open hosted by City of Ekurhuleni winner's lead was back to three shots.
But Stone dropped his first shot of the day at the eighth to slip back to 18 under.
Bryce Easton, Richard Sterne and Scot David Drysdale were in a share of third place on 13 under.