Sorry, Matt Barnes ... LeBron James would beat that ass in a street fight -- so says someone who would know, UFC tough guy Brad Tavares.
Tavares was chillin' at Sake Rok in Vegas for the UFC 202 fight when he admitted he's not really a Bron fan -- but knows what the guy could be capable of if he truly trained for a real deal fight.
Fun fact -- Tavares is fighting in LeBron's home state at UFC 203 next month.
But how would LeBron do against a real MMA heavyweight? Tavares says it wouldn't be pretty.
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