Brandon Stone extended his advantage to four strokes in the early stages of his third round at the Alfred Dunhill Championship.
The South African, who led by a single shot at the halfway stage of the event, made four birdies in his opening six holes on Saturday to get to 15 under.
Scot David Drysdale was among the chasing pack four shots back on 11 under after producing a flawless 64 on day three to set the early clubhouse target.
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.
The 23 year old made another gain at the short fifth before making it three in a row with a birdie at the sixth.
Drysdale got off to a fast start on Saturday, reaching the turn in 30 courtesy of gains at the second, fourth, sixth, seventh and ninth.
The 41 year old picked up another shot at the 11th before making back-to-back birdies at the 13th and 14th.
