... three bonafide legends who happened to be managed by Ali Abdelaziz. But, forced to pick the best fighter he's managed, Ali says it's the "Nigerian Nightmare."
TMZ Sports talked to Abdelaziz days before his star client, 35-year-old Usman, takes on Leon Edwards in the main event at UFC 278 in Salt Lake City ... and that's when we asked who was #1.
"It's very hard, man. You're talking about Henry Cejudo, two-division champion, defended two-weight divisions, right? Khabib, undefeated, never lost, barely lost a round," Ali told us, continuing, "But when you talk about Kamaru, for me Kamaru at welterweight, one of the hardest divisions in the UFC, he's beating these guys and he's sticking around.