Jake Paul is giving those picking Anderson Silva to win on Oct. 29 enough time to reconsider ... telling TMZ Sports they're going to lose all their money!!
We spoke with the Problem Child -- who's currently the betting underdog against the former UFC champion -- about his highly anticipated upcoming bout ... and despite having a ton of respect for his opponent, Paul tells us he's out for blood once they hit the ring.
"I'm knocking this guy out," Jakey P says ... adding the fight won't last past five rounds. "I'm promising everyone that."