Dustin Johnson Photo: VCG

Dustin Johnson exudes an air of cool nonchalance on the course but that calm exterior hides a burning desire to compile a major record that does justice to his rich talents.

The tears he shed upon winning the Masters with a record low score last weekend showed a rarely seen side of a player who was all too aware that many questioned whether he really had the inner fortitude to stand up and be counted on the biggest stage.

Johnson has almost an air of indifference when he speaks to the media in his ­monotone manner, which can give the mistaken impression that he doesn't really care.

The truth is rather different.

"I proved to myself that I do have it, because I'm sure a lot of y'all think that, or even I, there were doubts in my mind, just because I had been there," he said, looking every bit the part in his fresh Green Jacket.

"I'm in this position a lot of times. [I was thinking] when am I going to have the lead and finish off the golf tournament or finish off a major? For me, it definitely proved that I can do it.

"Since I played my first Masters, it's been the tournament I wanted to win the most."

Johnson shot a closing 68 and finished on a Masters record low score of 20-­under-par 268 at Augusta National, five shots in front of Australian Cameron Smith and South Korean Im Sung-jae, who both shot 69 in the final round.

He made a record low four bogeys in 72 holes.

Johnson got the job done with an ­unusual swing in which his left wrist is uniquely bowed rather than hinged at the top of the backswing, before ­giving way to an impact position that makes it virtually impossible for the ball to hook left.

"Now I think Dustin is the most complete player in the game," his coach Claude Harmon told a small group of reporters.

Another instructor who works with several tour players would not even try to teach Johnson's swing to an amateur.

"Just because he's won the Masters you wouldn't want to tell someone to do that," Brad Hughes told Reuters.

"It's pretty hard to do what he does. [Many would] probably break their wrists trying. He's obviously very supple in that area."