I'm heavier, but with muscle rather than flab. It's a massive difference. It means I don't get as tired sometimes and it means that I'm hitting the ball a lot farther, about 15 yards more with my driver.

In my case what happened next in 1999 was that I fell apart over that back nine. When I saw I was in genuine contention that year I felt like throwing up. That remains probably the most nervous I've ever been on a golf course.

Now I'm giving up a little in the week-to-week tournaments but reaping the benefits in the majors.

I'm heavier, but with muscle rather than flab. It's a massive difference. It means I don't get as tired sometimes and it means that I'm hitting the ball a lot farther, about 15 yards more with my driver.

I never take myself too seriously.

My dad said: 'It looks like you'll be world No.1 in a few hours and I wanted to be the first to say congratulations.

People confuse being world No. 1 with winning a Major championship.