4. Royce Gracie vs. Kimo Leopoldo

UFC 3

Royce Gracie is key to the UFC for a couple reasons. One, he was its first great champion, but two, he proved that in MMA, you cannot judge a book by its cover. The slender Brazillian just knew how to kick ass and take names, seemingly without breaking a sweat. Leopoldo came into this bout outweighing Gracie by 50 lbs, and he still could not escape Gracie's armbar.