By Matt Hardy Francis Ngannou believes he can knock Anthony Joshua out when the two heavyweights clash this Friday in Saudi Arabia. The winner of this bout could end up taking on either Tyson Fury or Oleksandr Usyk for an undisputed showdown but that fight has been pushed back. Ngannou, a former UFC champion, knocked Fury to the floor last year in a fight Fury won on a split decision and his match-up against Joshua this week will be only his second-ever professional fight. “I finished my training camp yesterday and I feel good,” the 37-year-old told Sky Sports. “It has been a tough eight weeks…