Stipe Miocic recently reflected on the toughest opponents that he faced in his career. The former UFC heavyweight champion competed against multiple icons of the sport during his incredible career. Mark Hunt may be best known for his one-punch knockout power, but the MMA legend was also an incredibly difficult fighter to put away. “Mark Hunt. Following his fight with Hunt, Miocic returned in January of 2006, where he started to put together the biggest year of his career.