Brandon Stone held a two shot lead as he reached the turn on day three of the Alfred Dunhill Championship.
The South African, who led by a single shot after Friday's second round, covered the front nine in 31 at Leopard Creek Country Club on Saturday to move to 15 under.
Englishman Chris Hanson was alone in second on 13 under, with Branden Grace another stroke back after notching four birdies in his first 12 holes.
Stone made the perfect start to his third round, rolling in his close-range birdie putt at the first before pulling off two important par saves at the second and third holes.
Following a stunning approach shot at the fourth, Stone converted his six foot birdie putt to get to 13 under before making another gain at the fifth.
The 23 year old then made it three in a row with a birdie at the sixth before safely parring the seventh, eighth and ninth holes.
Scot David Drysdale was among the group on 11 under after producing a flawless 64 to set the early clubhouse target.
