Conor McGregor dropped a "who the fook is this guy" and challenged Jeremy Stephens to a fight.

Check out live results of BKFC KnuckleMania 5 in Philadelphia featuring Eddie Alvarez vs. Jeremy Stephens and more.

Check out these photos from the bareknuckle boxing fights at BKFC: KnuckleMania 5 in Philadelphia.

Ben Rothwell needed just 36 seconds to viciously knock out Mick Terill and claim the BKFC heavyweight title.

On a BKFC: KnuckleMania 5 card filled with violent knockouts, Kaine Tomlinson Jr. took things to a new level against Patrick Sullivan.