Ross Fisher will head into the fourth and final round of the Tshwane Open with a five-shot lead.
The 33-year-old Englishman carded a five-under-par 67 to finish with an 18-under total of 198 at the Copperleaf Golf & Country Estate in Centurion, South Africa.
"I feel like I'm playing as good as I ever have, probably similar to when I was contending in Majors and getting myself into the 2010 Ryder Cup team," he told reporters.
"If I were to win here, it would be a massive confidence boost and a step in the right direction."
Michael Hoey (69) is currently second on the leaderboard, a shot clear of Simon Dyson (71) and Carlos Del Moral, who are tied for third place ahead of Sunday's action.