The trouble with me is I think too much. I always said you have to be dumb to play good golf.

I build confidence when I practice a variety of shots - hitting it high or low, working the ball. A lot of golfers go to the range and just hit full shots. That doesn't build on-course confidence, because you won't always hit full shots out there. My confidence is built on knowing I can effectively work the ball in any circumstance.

Once when I'd been in a lot of bunkers, my caddie told me he was getting blisters from raking so much.

I don't know why that putt hung on the edge. I'm a clean liver. It must be my caddie.