Vitor Belfort leads UFC history with 11 first-round knockouts

Vitor Belfort holds the UFC record with 11 first-round knockouts. Anthony Johnson ranks second with nine, while Michal Oleksiejczuk has eight. Sergey Pavlovich, Francis Ngannou, Andrei Arlovski, Cain Velasquez, Anderson Silva, and Derrick Lewis are tied with seven each.