Conor McGregor UFC debut: Promotion celebrates 10-year anniversary of first fight for 'Notorious' | CBS Sports Headlines Conor McGregor UFC debut: Promotion celebrates 10-year anniversary of first fight for 'Notorious' McGregor scored an emphatic knockout in his UFC debut, jumpstarting the most high-profile rise in mixed martial arts history ESN … Continue reading Conor McGregor UFC debut: Promotion celebrates 10-year anniversary of first fight for 'Notorious'