Frankie Edgar wrestled at Toms River High School East, making it to the state championship tournament three times. Edgar continued wrestling at Clarion University where he qualified for the nationals all four years.
Edgar accepted a fight with undefeated fighter Tyson Griffin at UFC 67 and Edgar won. Edgar followed with a victory over Mark Bocek at UFC 73. At UFC 78 he defeated Spencer Fisher. Edgar suffered his first loss at UFC Fight Night 13 against Gray Maynard but rebounded with a Fight of the Night victory against Hermes França at UFC: Silva vs. Irvin. Edgar then defeated former UFC lightweight champion Sean Sherk and defeated Matt Veach on The Ultimate Fighter 10 finale.
At UFC 112, Edgar defeated lightweight champion BJ Penn. ESPN announced Edgar as a nominee for Best Upset of the Year at the 2010 ESPY Awards. At UFC 118 Edgar again defeated Penn for the championship. Edgar’s next title defense was another match against Gray Maynard, at UFC 125. This rematch ended as a draw. Edgar fought Maynard for a third time at UFC 136 and won while earning Knockout of the Night honors. Edgar then faced Benson Henderson at UFC 144. Henderson defeated Edgar via a razor close decision as the bout earned Fight of the Night honors. A rematch with Henderson took place at UFC 150. Edgar lost via a highly questionable and roundly criticized split decision.