Logan Paul is champing at the bit to get revenge on Dillon Danis when they officially face off in their boxing match next month ... telling TMZ Sports his opponent is going to regret making it personal.

Of course, the former Bellator fighter has been on a tear on social media leading up to the bout ... targeting Paul's model fiancee, Nina Agdal, to the point she had to file a restraining order and lawsuit against him.

We spoke with Paul about the pre-fight antics ... and while he said he knew D.D. would bring the trash talk, he pointed out it's a bit different when lawyers gotta get involved.

"He's a crybaby, legitimately," Paul said. "I'm not just saying this to be like a mean fight companion trying to rile him up. He's a coward. He's made this fight entirely about a woman -- he chose to pick a fight with a woman. She fought back. He's whining about it. He's upset. He's making excuses left, right and center."

Logan added he believes Danis never planned to actually go through with the fight ... and only agreed to it so he could get clout and attention.

"He's the king of the ducks, all bark, no bite."

Despite going after Agdal, Logan said he's not worried one bit about getting too angry before entering the ring with his nemesis ... saying there's nothing Danis could do to get under his skin.

Speaking of Agdal, Logan said she WILL be at the fight in Manchester ... as they've both been fighting their own wars against Danis in their own ways.