This is not true. Most fiighters do not have the power to put one out cold with a single punch. Overeem, for instance, for all of his technical stand-up, lacks power and has never KOd anyone. Some fiighters have punching power, some do not. Fedor is one of the rare ones who can put anyone out cold with a single punch.
SUCKMYMUSCLE
I miss watching Tank Abbott put people to sleep in the mid 90's!
