By Jordan Moskowitz

Some experts are stating that if Andre Berto pulls out a victory on Saturday night, when he challenges Floyd Mayweather Jr. for the WBA/WBC welterweight titles at the MGM Grand in Las Vegas - it would rank as the biggest upset in boxing history.

One person disagrees with that viewpoint, and that man is former undisputed heavyweight champion James “Buster” Douglas, who pulled off what is widely regarded as the greatest upset in boxing history when he knocked out Mike Tyson in 1990 to capture the heavyweight crown.

Douglas was a 42-1 underdog when he entered the ring against Tyson. Berto opened up as a 50-1 underdog at certain sportsbooks in Las Vegas and as of Thursday he was listed at 32-1.

"I don't think it will surpass mine but it will be up there," Douglas said. "It would be close but like I said they're giving Berto a chance. I wasn't even given a chance. Even if the odds are what they are, I wasn't even on the books. But he possibly can. Anything is possible. Who am I to say he can't?"

Douglas gives Berto a shot, although he predicts Mayweather to win a twelve round unanimous decision.

"He definitely has a shot. He may just succeed in overcoming and he will definitely step up to the challenge. Berto is going to come and get it and he's going to try and give it his best," Douglas said. "I know he's a standup guy so that's what makes it so interesting. Looking from the outside in, I have to go with Floyd, because he's the top in the world, stays in terrific shape. I think it's a good fight but I think Floyd dominate late in the rounds and probably win by a decision."