Especially just coming off of the knee surgery. The left knee is flexed and turned during strong drives, and Tiger's drives are about as strong as they come. It definately couldn't feel too good working that knee, obvious by the winces and whatnot during the first 72 or so holes, but Tiger's...Tiger. He's just that damn good.
It's amazing that even people who have no knowledge of golf are fans of his; to me, it's like watching Jordan in his prime, watching something special, and seeing all that he's accomplished...and he's still very young.