The youthful visage is still there .
The 26 - year - old Northern Irishman 's physical transformation is unmistakable from just six years ago , when he won for the first time on the PGA Tour .
The youthful visage is still there , but the 26 - year - old Northern Irishman 's physical transformation is unmistakable from just six years ago , when he won for the first time on the PGA Tour .