Kamaru Usman doesn't care who doubts him ... telling TMZ Sports he STILL wants to box Canelo Alvarez, and wholeheartedly believes he can beat the world's best pound-for-pound boxer.
We shot the UFC welterweight champ Thursday night at Il Pastaio in Beverly Hills, and we asked the 34-year-old fighter ... "who's a name that interests you?"
"I've already said the name that interests me. Canelo. That's what interests me."
We then asked Usman about Dana White's recent comments, following Canelo's latest KO win over Caleb Plant, where the UFC president said "[Kamaru] doesn't want to fight Canelo" -- because Alvarez is so damn dangerous in the ring.