I take a more flexible approach... Look at which matches might interest me, but then play it by ear once I'm there. If a match that I had interest in going to is at 6-0, 4-1, I'll take a pass. If a match I hadn't planned on attending looks like it will head to a third (or fifth) set, I'll try to get there. You can plan til the cows come home, but as dry said, one five-setter (or withdrawal, retirement, injury timeout, etc) will change the best laid plans.