David Benavidez says an ass whoopin's waiting for Caleb Plant on Saturday ... telling TMZ Sports he's gonna "put a beating" on his longtime enemy during their upcoming fight, and Canelo's next on the hit list!
We spoke to Benavidez (26-0 w/ 23 KOs) -- one of the most talented fighters in the world -- ahead of his highly-anticipated matchup, pitting David vs. Caleb in the main event of Saturday's Showtime Boxing card.
"This fight has everything everybody wants to see," Benavidez said. "It has bad blood, it has drama, it has two fighters that really don't like each other go at it. I really dislike Caleb Plant."