South African Charl Coetzee made four birdies in his last seven holes to move into a one-shot lead at the at the Tshwane Open after a second-round 65.
The 26-year-old world No 972 moved to 12-under-par early in the day at the Copperleaf Golf and Country Estate in Centurion, long before an afternoon thunder storm brought play to an abrupt halt on Friday.
"I haven't had this much fun in a long time," said Coetzee, who has yet to win in his professional career. "It's always nice to play well and it goes both ways, the better you play the more you enjoy it."
Coetzee was four clear of the field before the afternoon session, where Mark Tullo of Chile recorded a 66 to cut his lead to a stroke.
American Peter Uihlein, a former U.S. amateur champion, chipped in at the last for a round of 66 to lie fourth on 10-under.
In all, 53 players had to return on Saturday morning to complete their second rounds.
Dawie van der Walt finished Friday on 11-under par, including seven birdies, and maintained that score when he came back to complete his final four holes on Saturday.
First-round leader Darren Fichardt was also among those yet to complete his round on Friday, picking up just one shot in 16 holes to get to eight-under - a mark he was still on when he did manage to complete his round.
The only significant change at the top of the leaderboard on Saturday morning saw Romain Wattel drop a shot at the last to fall into a 10-way tie for fifth place on eight-under.