Scott Smith was known as "Hands of Steel." However, people started to know him more as the Comeback Kid after making a huge impression on the latter half of his career in MMA. He managed to pull off what ended up being among the most dramatic victories in the sport, gaining the win over his opponent, Pete Sell.
These two were brawlers, and they did not hesitate to showcase their skills on each other. Neither one was technically gifted, but they had a lot of power behind their strikes. Smith was already pretty hurt by the third, hobbling to the cage after getting struck to the sternum by Sell. The latter decided to rush in for the win, only to be met by one of Smith's signature KO punches, resulting in his fall to the ground. This was definitely a performance that almost seemed like an upset win, if only because of the clear indication that Smith was too hurt and exhausted. Yet, out of nowhere, he pulls off a win.
From UFC 98
Knocking out Rashad Evans is impossible, unless your name is Lyoto Machida. Even Machida pushed it to the limit to get the finish against Evans. It took around five or six clean shots on the chin of Evans to finally get the former champion to go down. Despite getting finished, Evans proved that he is one of the toughest fighters in the UFC. Most guys would have gone down a long time ago. Regardless, Machida’s knockout to win the UFC’s light heavyweight belt is a thing of beauty. With the power of Evans’ hands, it takes a lot of skill and guts to swing like Machida did. However, with resolve and determination, Machida emptied the gas tank and finally knocked Evans out cold. Machida is the only fighter to ever knock the great Rashad Evans out. Evans clearly has an iron jaw, as evident in this fight. However, it goes to show how good Lyoto Machida really is, and how hard he can strike.
When you add the belt to this equation, it makes this knockout truly amazing. Machida is probably the most unique striker to ever compete in mixed martial arts, but it took sheer will and endurance to get this finish. Especially when you factor in that Evans fought until he literally could not stand anymore.