Anything can happen in a fight.
It’s the basic truth that makes boxing so compelling to watch and to bet on.
No matter how favored one man is over the other, once the bell rings and the fight is on, each man has “a puncher’s chance” at the very least.
With Floyd Mayweather and Conor McGregor scheduled to meet in the boxing ring Saturday night, very few people are giving McGregor a shot to win.
Though he's garnered great public support, it's McGregor's first professional boxing match, and he's going up against Mayweather and his unblemished record.
Since the fight was officially announced, many experts, former fighters, and previous opponents of Mayweather and McGregor have weighed in with their thoughts on how the fight will go on Saturday night in Las Vegas.
Below we've rounded up all the expert predictions for who will win the biggest fight of the year.
Manny Pacquiao, former Mayweather opponent
Prediction for the fight: Floyd Mayweather
Quotes: "McGregor has no chance in this fight. In fact, it could be very boring."
"There is no way he will be able to land a meaningful punch on Floyd. How could he? He has no professional experience in boxing."
Mike Tyson, former undisputed heavyweight champion
Prediction for the fight: Floyd Mayweather
Quote: "Conor McGregor is going to look really ridiculous boxing [Floyd Mayweather]. But if he goes in there with the UFC stuff [mixed martial arts], then it could be pretty interesting."
Tyson Fury, former heavyweight champion
Prediction for the fight: Conor McGregor
Quotes: "I think Conor McGregor will knock him out in the first 35 seconds, much like he did to Jose Aldo, to be honest. Come on, McGregor!"
"It would be great for boxing if McGregor chinned him … it would be great for the real people of the world."
Teddy Atlas, trainer and ESPN boxing analyst
Prediction for the fight: Floyd Mayweather
Quote: "He has no chance in a traditional boxing match. His only chance would be with MMA rules, where he could try to bring Floyd to the mat where he could - of course - easily be the victor."
Daniel Cormier, former UFC light heavyweight champion
Prediction for the fight: Floyd Mayweather
Quotes: "Floyd kills him."
"Conor McGregor can't box Floyd Mayweather. Let's be real with ourselves. Neither one of these guys can do the other guy's sport."
Dana White, president of UFC
Prediction for the fight: Conor McGregor
Quote: White went on "Conan" and gave four reasons he believed McGregor could win the fight.
"Conor McGregor is huge." "McGregor is in the prime of his career and 27 years old. Floyd Mayweather is 40 years old." "Conor is a southpaw and Floyd has problems when he fights southpaws." "McGregor hits hard. When he hits people, they [get knocked out]."
Joe Rogan, UFC commentator
Prediction for the fight: Undecided, leaning Mayweather
Quotes: "Mayweather is just a way better boxer. There's no doubt about it. He's one of the greatest boxers, if not the greatest boxer who ever lived. And even though he's smaller, we're talking about a completely different level of skill and understanding of the nuances in boxing."
"But Conor McGregor is not incompetent. He's incredible. McGregor is dangerous as f---. And he has a deceptive ability to move in and move out. He can cover distances very quickly."
Jose Aldo, former UFC featherweight champion, lost to McGregor in 14 seconds
Prediction for the fight: Floyd Mayweather
Quote: "There is no comparison. It is not similar. Totally different. There is no way McGregor can defeat Mayweather. Mayweather has done this his entire life, and it's a different sport."
Angelo Reyes, boxing coach
Prediction for the fight: Floyd Mayweather
Quote: "Mayweather will knock him out in three (rounds) or less. Everybody thinks, 'Oh, well, Floyd is just going to dance around.' Not in this fight. And he doesn't dance around. I don't think he dances around anyway. You have to truly understand the craft of boxing to really understand what he does."
Read more here at MMA Fighting.
Seth Rollins, former WWE World Heavyweight Champion
Prediction for the fight: Floyd Mayweather
Quote: "I guess Conor's always got a puncher's chance, right? But that's about all he's got in a boxing match against Floyd. I think Floyd is going to dance around him. I'll be surprised if Conor lands one punch on Floyd. But to say that, if he does land that one punch, he's got some real power, so you never know. But if I'm a betting man, my money's on Floyd, all the way."
Andre Ward, world's best pound-for-pound boxer
Prediction for the fight: Floyd Mayweather
Quote:"I think McGregor will be wild for the first three rounds, but when he starts to tire, Floyd will take over and we could see a big knockout."
Demetrious Johnson, UFC flyweight champion
Prediction for the fight: Conor McGregor
Quote: "I'm riding with Conor. I think Conor - he can probably get it done sooner if he goes out there being ferocious ... I'm going with Conor. I think Conor's gonna get the job done. It's hard to say. I'll tell you what: He ain't gonna make a big check like that in the UFC. Hopefully Conor goes out there and knocks Floyd out, and then he can go ahead and fight the winner of GGG and 'Canelo' Alvarez. I'd love to see that."
Tony Bellew, WBC cruiserweight champion
Prediction for the fight: Floyd Mayweather
Quote: "If these two guys were to get in a cage, it would be over within a minute. But these two guys aren't going to get in a cage. They're going to get in a ring, and it will be over whenever Floyd Mayweather sees fit."
Ronda Rousey
Prediction for the fight: Undecided
Quote: "I think they'll both make a lot of money."
Nate Diaz, only UFC fighter to ever beat Conor McGregor
Prediction for the fight: Undecided, but McGregor has a shot
Quote: "I fought Conor for 25 minutes. I believe he's definitely going to have a chance. Fighting and beating the best boxer pound for pound in the world right now? That's another story, but a fight's a fight, and we're going to have to watch and see what happens. Hopefully it will be a hell of a fight."
Read more here at MMA Fighting.
Max Kellerman, ESPN personality and boxing analyst
Prediction for the fight: Floyd Mayweather
Quote: "Mayweather would literally be a tremendous value at 50-to-1."
Conor McGregor
Prediction for the fight: Conor McGregor
Quotes: "My fist is just going to break his whole face and that's it."
"Let's not kid ourselves here who the big star is of this show," McGregor says. I'm "a slick, Irish, handsome kid who has climbed to the top of the game quicker than anybody else has ever done it."
"I'm always looking to make history … and here we are again, more history."
Floyd Mayweather
Prediction for the fight: A knockout
Quote: "One hundred percent, it will not go the distance. One hundred percent chance this fight won't go the distance."
Now check out how McGregor made his way from Dublin to the top of the fighting world
How Conor McGregor went from Dublin plumber to king of combat sports