In any global sport, there's a fine line between what's known as good and what's known as great.
There are many good athletes in the world of sports, but there are few who receive the recognition of "great."
In mixed martial arts, fighters are classified by what they achieve over the course of their career.
More times than not, a fighter recognized as great will have a title to show for their accomplishments.
Specifically in the UFC, there have been some of the greatest champions who've stepped away from the sport while others remain alive and well.
So, the following slides display the 10 greatest champions in UFC history.