Why is Greg Norman called The Great White Shark?

More about Greg Norman, The Great White Shark

Greg Norman earned his nickname "The Great White Shark" or often shortened to just "The Shark" playing in the 1981 Masters.

1981 was his debut at the Masters in Augusta.

Norman was leading after the second day and mentioned in an interview: “"I grew up in Queensland, Australia. I grew up on the Great Barrier Reef. I’ve dived with sharks. And that was what I just did as a kid."

The next day the newspaper “Atlanta Journal-Constitution” published 'The Great White Shark' in one of their headlines.

Greg Norman finished 4th just three strokes behind the winner Tom Watson.

How many Majors has Greg Norman won?