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Sylvester Stallone Floyd Will Stay Undefeated Unless ...

8/6/2015 2:55 PM PDT

Sylvester Stallone -- Mayweather Will Stay Undefeated … Unless (VIDEO)


Sylvester Stallone knows the secret to defeating Floyd Mayweather Jr. … but it doesn’t have anything to do with his next opponent, Andre Berto.

Almost no one is giving Berto a chance to win the fight -- so we asked Sly if he thinks he's even got a puncher's chance to upset Money. Check it out ... Sly says there's a chance, but not a puncher's one. 

Stallone also throws a playful jab at "Southpaw" star Jake Gyllenhaal's on the topic of big screen boxers. We'll give you one guess which actor/fighter he IS backing.

Yep. You got it.

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