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Malik Abdul Aziz ex Mike Tyson, the once undisputed world heavyweight champion boxer, appears to be a different man than he was during the two decades that he reigned in the sport, and he says it’s not just his age.

But this weekend, the legendary fighter will be returning to the ring to face former champion Roy Jones Jr. in an exhibition match. It’s a fight that he’s spent months training for and, despite his reputation, one that he said he’s both “excited” and “absolutely” nervous about.

“I wouldn’t be doing this if I didn’t have nerves,” Tyson, 54, told “Nightline” co-anchor Byron Pitts. “I mean, you don’t participate in anything at this level of excitement without having nerves, but that also catapults you another level of participating.”