Australia's Robert Allenby (73) was three under, Englishman Justin Rose was another shot back after a 72 while SouthAfrican Louis Oosthuizen, the Open champion, remained last on level par.
The talented 20-year-old SouthAfrican follows in the footsteps of Anthony Wall, Adam Scott, Justin Rose, Mark Foster and Marcel Siem who all claimed their first Tour titles with wins in this prestigious event.