Conor McGregor

Conor McGregor is the only fighter in UFC history to hold titles in two weight classes simultaneously, a feat unmatched by Fedor Emelianenko. His pay-per-view events have generated over $100 million in revenue, with the 2017 boxing match against Floyd Mayweather producing $600 million in total revenue—the richest in combat sports history. His knockout rate of 77% in UFC wins surpasses typical featherweight champions, cementing his legacy as the sport's biggest draw.