Play was halted for the day in the third round with Branden Grace and Richard Finch perched atop the leader board at 15-under par.
George Coetzee was in third place at 14-under. Andrew Parr and Dawi Van Der Walt managed to complete their rounds Saturday and were in the clubhouse in fourth place at 12-under 203.
Finch will have to play his final four holes of the round on Sunday before moving on to the final round. Grace has three holes to complete first thing Sunday, weather permitting.
The Joburg Open has seen weather delays on all three days.