Norris shot a five-under 67 and moved to 23-under-par at low-scoring Steyn City, where players have been benefiting from preferred lies because of heavy rain in the Johannesburg area before the tournament.

The South African's nearest challenger is compatriot Dean Burmester, who was 19-under after a round of 66.

Germany's Matti Schmid (64) is a shot further back on 18-under and Denmark's Joachim B. Hansen and Sweden's Sebastian Soderberg are tied for fourth at 17-under, after both carded rounds of 67.

Those players lead the international contingent and are the best hopes of preventing a home victory at the Steyn City Championship's debut on the DP World Tour.

Jason Scrivener (70) is best of the Australian duo to make the cut at seven-under and a share of 51st while Maverick Antcliff (71) is a shot further back in the group tied for 57th.