Stipe Miocic has just over six years of professional MMA experience under his belt, but at UFC 198 he will face one of the heavyweight division's most enduring competitors.
Not only is Fabricio Werdum the UFC champion, but he is inarguably one of the greatest heavyweights of all time, having bested such towering figures as Fedor Emelianenko, Cain Velasquez, and Alistair Overeem over the course of his rambling 14 year career. Werdum is a dangerous finisher in all phases. He has submitted Antonio Rodrigo Nogueira, and knocked out Mark Hunt.
In short, beating him is a tall order for any challenger, Miocic included.