BEEN DOING MY HOMEWORK TMZ.com
Kamaru Usman has lost three fights in a row ... but Joaquin Buckley, the man fighting the former champ Saturday night in the main event of UFC Fight Night, tells TMZ Sports that doesn't even begin to tell the full story!
In fact, not only does Buckley NOT believe Usman's washed ... he actually feels that on paper, this is the toughest test of his career -- and that's coming from a guy who has fought and defeated Colby Covington, Stephen "Wonderboy" Thompson, and Vicente Luque!