"We can safely say that if I do it this year, I will retire."

It's funny, two months ago at the Masters, all of the talk was centered around a potential grand slam.  Now, everyone knows it's out of the question.  Even Trevor Immelman joked about it with the press earlier today:

I would be the happiest guy on earth if I did it over the span of a career. We can safely say that if I do it this year, I will retire. I mean there’s no chance of that.  I haven’t even, not even for one second thought about that.