Pieters, 66, out in front
The South African carded eight birdies, an eagle and three bogeys to lead from a group of five players – including Englishman Miles Tunnicliff, Jean-Baptiste Gonnet of France and fellow countrymen Jaco Van Zyl and Branden Grace – on six under.
Swede Fredrik Ohlsson is the other member of the group, although he still had one hole to play when bad light forced play to be stopped in the co-sanctioned European and Sunshine Tour event.
More than 90 minutes had been lost at the start of the day due to heavy mist and rain hanging over the East London Golf Club., meaning several players will have to complete their rounds today.