Vitor Belfort leads UFC first-round knockouts with 11

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