Whether divisional contenders or irrelevant gatekeepers, many UFC fighters lack a strong chin.
It has created an imbalance in their natural ability to sustain pain, pressure and perfection.
Many of these fighters have been unlucky enough to be part of some of the most vicious knockouts of all time.
It's truly an exclusive group that no professional athlete wants to be a part of.
Here are the most suspect chins in the UFC today.