There have been many shocks in the world of boxing over the years, and there will no doubt be plenty more to come in the future, but the big question is, are we going to see an upset this weekend?
British fighter Tony Bellew has already managed to cause a few upsets in his boxing career, most notably his two victories over former two-weight world champion David Haye, and he will be hoping to cause the biggest upset of his career this weekend.
The 35-year-old Liverpudlian will take on the undisputed cruiserweight champion Oleksandr Usyk at the Manchester Arena on Saturday night, but, while the self proclaimed "Fat Scouser" will have home advantage, there are not many people who are giving him much of a chance.
With that said, some of the experts have been weighing in on what they think Bellew will need to do in order to dethrone Usyk, and it seems that both Carl Froch and Johnny Nelson are in agreement that we could see a possible shock.
Sky Sports asked their boxing specialists about Bellew's physique, and wanted their opinions on his not so muscular appearance.
Froch explained: "I was quite physically chiselled and I had a good athletic physique, but you've got top fighters who look quite smooth, with a bit of a layer on them.
"It doesn't make any difference at all.
"It's a boxing match, not an aesthetic fitness competition. It's all about being able to fight, and Bellew can bloody fight, believe you me."
Meanwhile, Nelson added: "Bellew won't be ripped, but he doesn't need to be.
"They will be the same weight, and all Tony had to do to get back down to cruiserweight was diet.
"It needs discipline and it doesn't mean he will have new muscles we've never seen before.
"He will feel comfortable and still feel strong. It might surprise Usyk at the weigh-in, but he will have seen Bellew fight before. We know Bellew has power and this isn't about muscle, it's about fitness and skill."
Will Tony Bellew have the fitness and the skill to beat Oleksandr Usyk? We will find out on Saturday night.