Dana White once said that the reason MMA is successful is because fighting is a base human behavior. If there are four corners, and one has a basketball game, one has baseball, one has street hockey and then a fight breaks out on the fourth, where are all the people going to go? Obviously they're going to run over and watch the fight. But if some of the fights on this list had been happening, they would've gone back to their original corners pretty quickly. With UFC cards occurring at a staggering frequency, it's become hard to keep up with who is fighting who at any given time. Between pay-per-view, Fox, Fox Sports 1 and the digital network UFC Fight Pass, there seemingly isn't a weekend that goes by without the chance for us rabid fans to get our fix of fisticuffs. The downside to that frequency is less marquee fights, main events that carry an entire card based on the anticipation. When guys like Constantin Philippou and Dong Hyun Kim are seeing their names at the top of the poster something's wrong. It's not that they're bad fighters, but fans want to see main events featuring guys who they're emotionally invested in, with something on the line. And sometimes even that's not enough. With 173 big events in the books as well as a multitude of Fight Nights, The Ultimate Fighter cards and TV specials, the potential for great fights is limitless, but unfortunately the same can be said for the letdowns. The following list will take a look at main events that, for one reason or another failed to deliver. Some were unable to follow through on the incredible hype surrounding them and a few were trainwrecks of questionable tactics while most of them were just downright boring. So let's take a look back at UFC's 10 Biggest Main Event Flops.