“T he only expectation I have is that it will end in a knockout,” Fabio Wardley says cheerfully as he looks ahead to his dangerous first defence of the WBO world heavyweight title against Daniel Dubois in Manchester on Saturday night. “Don’t Blink” is the promotional tagline for a battle between two powerful yet vulnerable heavyweights and, for once, this is less boxing bluster than reasonable advice for anyone watching a fight which could be the most dramatic heavyweight contest this year. Wardley and Dubois are devastating punchers who also often look at risk of losing. Dubois has been beaten three times in 25 fights while dispatching his other opponents with brutal efficiency. Two years ago, the unbeaten Wardley came close to defeat against Frazer Clarke in their first fight, which ended up being a draw after a damaging bloodbath for both men.…