Anthony Joshua feels he must knock out Kubrat Pulev to avoid failure

• WBC and IBF heavyweight champion faces Bulgarian in Cardiff next month
• Joshua has stopped all 19 of his opponents: ‘I like knocking people out’Anthony Joshua’s words were cordial. The respect for his opponent obvious. But Britain’s WBC and IBF heavyweight champion also wanted to make something clear: if he does not knock out the Bulgarian Kubrat Pulev when they meet in Cardiff next month he will consider his night a failure.“It is heavyweight boxing,&r