Simon Dyson birdied his last four holes in a 7-under 65 to take the clubhouse lead at the Tshwane Open on Thursday.
Trevor Fisher Jr. was also 7 under through 16 holes of his opening round before play was suspended because of a thunderstorm in Centurion.
Englishman Dyson made a strong finish at Copperleaf Golf and Country Estate and had seven birdies in all and no dropped shots on the Ernie Els-designed course. South Africa's Fisher Jr. also had seven birdies but with two holes to complete in his opening round.
Another Englishman, Ross Fisher, and South Africans Jared Harvey and Erik van Rooyen shot 6-under 66s to be a shot behind Dyson in the European Tour event.