Those watching Jake Paul vs. Gervonta Davis better keep their cameras ready ... 'cause El Gallo tells TMZ Sports he's knocking out Tank -- and he's hoping it's in one of the most spectacular fashions the sport's ever seen.

The YouTuber-turned-boxer sat down with us recently to break down his upcoming fight with the undefeated Davis ... and check out our interview, Paul is clearly confident he's going to get the win. Getty

In fact, he guaranteed a KO -- promising "I'm going to knock this guy out."

He added the punch will "probably create one of the most viral knockouts in the history of boxing." Gallery Launch Gallery Getty

The highly anticipated bout is a little less than two months away, but Paul said he's already "locked in, fully focused" and "feeling amazing."

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