Photos: Conor McGregor returns to the octagon Conor McGregor celebrates after knocking out Donald Cerrone in their welterweight fight during the UFC 246 event at T-Mobile Arena on Saturday in Las Vegas. Hide Caption 1 of 16

Photos: Conor McGregor returns to the octagon McGregor hits Cerrone during their UFC 246 welterweight mixed martial arts bout. Hide Caption 2 of 16

Photos: Conor McGregor returns to the octagon McGregor lands a knee to the face of Cerrone. McGregor blitzed Cerrone from the opening bell and won the fight less than a minute into the first round. Hide Caption 3 of 16

Photos: Conor McGregor returns to the octagon McGregor celebrates after defeating Cerrone. McGregor improves his career professional record to 22-4 with 19 knockouts. Hide Caption 4 of 16

Photos: Conor McGregor returns to the octagon Cerrone reacts after his TKO loss to McGregor. Cerrone, the UFC's all-time winningest fighter, drops to 36-14 in his professional career. Hide Caption 5 of 16

Photos: Conor McGregor returns to the octagon McGregor is seen with his eyes closed after arriving on the octagon. Hide Caption 6 of 16

Photos: Conor McGregor returns to the octagon McGregor acknowledges the crowd after entering the octagon. Hide Caption 7 of 16

Photos: Conor McGregor returns to the octagon Cerrone heads to the octagon before his welterweight fight against McGregor. Hide Caption 8 of 16

Photos: Conor McGregor returns to the octagon McGregor kicks Cerrone in the face. Hide Caption 9 of 16

Photos: Conor McGregor returns to the octagon A general view of the octagon showing the colors of Ireland during the McGregor-Cerrone UFC 246 event. Hide Caption 10 of 16

Photos: Conor McGregor returns to the octagon McGregor walks away after knocking out Cerrone in their welterweight fight. Hide Caption 11 of 16

Photos: Conor McGregor returns to the octagon McGregor and Cerrone shake hands after their welterweight fight. Hide Caption 12 of 16

Photos: Conor McGregor returns to the octagon Conor McGregor is hugged by Jerry Cerrone, the grandmother of Donald Cerrone, after the bout. Hide Caption 13 of 16

Photos: Conor McGregor returns to the octagon Cerrone has his hands taped. Hide Caption 14 of 16

Photos: Conor McGregor returns to the octagon McGregor has his hands wrapped. Hide Caption 15 of 16