As is the case with just about any full contact sport in existence, the competing favorite is likely to emerge victorious over opposition a good eight of ten times. Even in a sport as erratic as mixed martial arts, the odds makers tend to do their homework, and usually make the right picks. However, when the cycle is broken by the resilient underdog, it’s an amazing sensation, and it echoes in the memory.

In the last 18 years many a favorite has fallen at the hands of the unsuspecting challenger; the man ushered into the cage to become little more than another tally in the favored participants win column. Sometimes upsets are squeezed out on the score cards, sometimes they arrive in fast, dramatic fashion, and now and then an unforeseen variable alters the outcome of a fight. When it comes to the truly memorable upsets, there are a few that just cannot be forgotten.