The biggest win of Tyson Fury's pro career was a twelve round unanimous decision over Wladimir Klitschko in November of 2015 to capture the WBA, IBF, IBO, WBO heavyweight titles.

The victory was one of the biggest heavyweight upsets in the last decade. At the time Klitschko had been unbeaten for over 10 years and was heavily favored to win.

That victory was the last bout for Fury for over two years, who in the aftermath was dealing with issues related to his mental health and substance abuse, and eventually lost all four of his belts outside the ring.

After returning to the ring earlier this year, Fury picked up two easy wins.

But on December 1, Fury will challenge WBC heavyweight champion Deontay Wilder (40-0, 39 KOs) in the main event of a Showtime/BT Sport Pay-Per-View from Staples Center in Los Angeles.

Wilder, who at one time served as a sparring partner for Klitschko, has watched Fury's biggest win on several occasions - and he believes that it's not about what Fury did, but the outcome was more about what Klitschko didn't do.

"It was a boring good win," Wilder told BT Sport.

"When I look back on that fight, the only thing that goes in my mind is what if Klitschko would have threw more punches? What if he had the confidence to throw more punches? Instead of just sitting there and being hesitant.

"I bet he [Klitschko] has thought about this many times 'only if I would have!', because he would have changed the trajectory of the whole fight. If he would have thrown punches.

"You can't be stiff or like a robot with a fighter like that. That's why with me, I'm so mobile, agile, hostile, I've got a heart of a lion. I am a king. I can't have no guy that is right here facing me like that because you're going to get crushed."