South African Branden Grace continued his domination of the Leopard Creek Country Club course to establish a healthy lead at the Alfred Dunhill Championship.
After an opening round 62, Grace sunk seven more birdies, his only blemish a dropped shot on the par-three fifth hole, to card a six-under-par 66 and open a five-shot advantage over Italian Francesco Molinari.
Kevin Phelan was the only Irish player to make the cut in in South Africa, finishing on one under par, after a 71 that included four birdies and three bogeys.
Damien McGrane's 73 left him level par and one short of qualifying for the weekend.
Peter Lawrie dropped six shots, including a double-bogey and a bogey, in his final three holes for a six-over 78.
Grace is on 16 under par for the tournament and feeling very comfortable with his game.
"The ball striking wasn't as good as yesterday but I kept it going. There was a little bit of a slip there due to a lack of concentration but it happens," he said.
"I've been hitting it good and kept on hitting good putts out there."
Molinari produced the best round of the day with six birdies, an eagle at the par-five 13th and a single dropped shot for a 65 to go with his opening 68.
Briton Danny Willett, last weekend's Nedbank Challenge winner, was two shots back on nine under par following an erratic 69.
Home favourite Charl Schwartzel, who has won the event in the last two years, looks out of contention after he could only manage a 70 to fall 11 shots behind Grace.
