Quinton Jackson's bout with Lyoto Machida in UFC 123 tonight might just be the most important fight of Rampage's career.

Machida is obviously no easy opponent, and he will be trying to bounce back from the first loss of his career.

But Rampage clearly has more hanging on this fight. It's been over a year and a half since his last victory, and he's a significant underdog against Machida. Put simply, he definitely has something to prove when he steps into the Octagon tonight.

Here are the Top 10 reasons that UFC 123 is the biggest fight of Rampage's career.

Begin Slideshow