UFC 153 features fighters who are both well accomplished in this sport and young lions who are just beginning to hit their stride.
Fighters such as Anderson Silva and Stephan Bonnar are nearing the end of their careers and have highlights for days.
But young up-and-comers like Erick Silva are just getting started in this sport, and their career-defining moment may not be within sight. Heck, the way Silva's been ripping through competition, his career-defining moment may happen when he's a champion one day.
So keeping that in mind, here are the career-defining moments for each fighter on the UFC's main card of UFC 153.