Yet Dubai resident Stenson, who looks certain to book his spot at next week’s DP World Tour Championship, picked up a succession of gains at the seventh, eighth and ninth to move four strokes clear.
Coetzee was punished for his agressive putting with bogeys at the 12th and 15th while Bremner, playing with Stenson and his Swedish counterpart Magnus Carlsson, was unable to cut the gap at the top.
Charl Schwartzel, who was one of several players to finish his second round this morning after a thunderstorm brought a premature end to proceedings yesterday, slipped off the pace in search of his first national title at the 11th attempt.
The 2011 Masters Tournament champion was nicely poised at eight under but two double-bogeys in three holes saw him fall back.
Ryder Cup hero Martin Kaymer was the first player to shoot under 70 in the penultimate round as he signed for a 68 which moved him to eight under.