Click on people's faces in the photo to tag them. Patti will be asked to approve all tags before others can see them. With the vast array of knockout artists in the UFC it can be quite difficult to separate the best from the rest, but Heavy.com has narrowed the list down as best as possible. Let’s take a look at the top 10 power punchers currently under contract with the UFC. 10. Roy Nelson Nelson doesn’t exactly have the best physique in the sport, in fact he looks like a man who has had one too many ...