Fans go wild for 'INSANE' fight between Kamaru Usman and Khamzat Chimaev in UFC 294 co-main event, as they laud 'Nigerian Nightmare' for stepping up on just 10 days notice

Kamaru Usman's late inclusion to fight Khamzat Chimaev at UFC 294 has been greeted with plenty of fanfare. On just 10 days notice, the former welterweight champion is stepping up