The 30 - year - old world number 85 is the first Scot to win a WGC and had six birdies in a four - under 68 to finish 20 under .
85 was seventh reserve .
The 30 - year - old world number 85 , who was seventh reserve , is the first Scot to win a WGC and had six birdies in a four - under 68 to finish 20 under .