From 1994 to 2001 for UFC 4 to UFC 32, Blatnick served as a commentator for the Ultimate Fighting Championship, and was officially named as the commissioner of the UFC during UFC 17. During this time he was involved in the development of the modern rules of the sport. Bob Meyrowitz, the original owner of the UFC, tasked Blatnick to push the sport forward. With help from referee John McCarthy and then UFC matchmaker Joe Silva, Blatnick created a manual of policies, procedures, codes of conduct and rules, many of which exist to this day. He traveled around the country, educating regulators and changing perceptions about a sport that was thought to be bloodthirsty and inhumane.