Paul Waring was among a host of players unable to finish their second round at the Joburg Open, but still led the way by a stroke when play was suspended due to darkness.
The field was already playing catch-up after a number of competitors were forced to finish their first round on day two due to heavy rain on Thursday.
And the second round will now run into day three, with Englishman Waring - who is 12 under for the tournament - still needing to complete the final six holes.
Waring was able to finish his opening 18 holes on Thursday and went into the second round two shots adrift of overnight leader Paul Peterson.
But, as Peterson struggled to match his first-round 62, Waring continued his upward momentum to go five-under-par through 12 holes.
Waring started his round with back-to-back birdies, and a further three followed at nine, 10 and 11. He then made par at 12 before the light halted his progress.
Peterson, by contrast, sits at seven under after he went two over for the opening 12 holes. The American was one over at the turn and, although he gained a stroke at the 10th, that birdie was followed by consecutive bogeys at 11 and 12.
Darren Fichardt was able to complete his second round and carded a second straight 66 to move to 11 under - one shot behind Waring.
Dean Burmester is also 11 under after going six under through 15, while Jacques Kruyswijk is within two strokes of Waring as he recorded a 70 for his second round.
Five players are within three strokes of Waring on nine under, with Romain Langasque the only one of that group not to have finished his second round, the Frenchman completing 12 holes before play was stopped.