Being a champion is never a sure thing in the UFC. There are always up-and-comers who will be looking to take the belt and former champions looking to get it back.
Champions will lose eventually, but the true sign of a champ is if you can come back and reclaim "your" belt.
In the history of the UFC, only four fighters have ever accomplished such a feat. Those four are Randy Couture, Matt Hughes, Georges St-Pierre and Tim Sylvia.
Here are five fighters who will have a chance to add their names to that list of outstanding Hall of Fame-worthy fighters—and Sylvia.