International Boxing Federation (IBF) super middleweight champion Carl “The Cobra” Froch (29-2, 21 KOs) has warned challenger Yusaf Mack (31-4, 17 KOs) that he will pay for his pre-fight jibes when the pair meet Saturday, headlining the “True Brit” pay-per-view event (in the U.S.), live from Nottingham, United Kingdom.