I played the U.S. Open course at Torrey Pines a few months ago, and they had just began growing out the rough. It was still killer and I can't imagine how bad it will be during the Open. I shot 96 and played decent and I'm about a 6-7 handicap. The most important thing (besides length) to break 100 will be keeping it out of the rough and putting well. The greens were ridiculously fast and very hard to read and hilly when I played them and that wasn't even at the time of the Open.