Everyone has a different definition of what a "classic" fight is. When you watch a fight, what are you looking for when determining the greatness of the match? - Technical brilliance? (Fedor/Cro Cop) - Resilience/Damage taken? (Lawler/MacDonald 2 - Shogun/Henderson) - A great comeback? (Sonnen/Silva) - A huge upset? (Serra/GSP) Those are just a couple examples - there are plenty of other factors to analyze. I'm sure most people take multiple factors into account when evaluating the greatness of a fight... Let me know what factors into your opinion of a truly great fight.