Tim Bradley has given his views on this weekend's welterweight title clash between Terence Crawford and Jeff Horn in Las Vegas.
Crawford aims to take Horn's crown following on from an impressive reign at super-lightweight and Bradley sees the American as a sterner test for the Aussie than last summer's opponent Manny Pacquiao.
"I believe that this fight will be a tougher fight than Manny Pacquiao because there is so much more dimensions to Terence Crawford than to Manny Pacquiao," said Bradley.
"You know what you're going to get when you fight a guy like Manny Pacquiao. He's coming to get you. Terence, on the other hand, is multi-dimensional. So he can make adjustments on the fly without his corner even telling him to make adjustments.
"I've had the opportunity to have two training camps with Terence Crawford before Terence Crawford became -- before anybody knew who he was.
"One of the things that I took from him during that training camp was that this is a kid that flew down here by himself to my hometown, came (indiscernible) without a coach, without a trainer, getting fed a little bit of information about myself, gets in the ring, basically puts on a show. Beats me up in front of my own people -- beats me up, comes back the next day.
"I come back with a plan. He comes back and completely -- he comes back and he's a completely different fighter than he was the day before. And he kept making adjustments, and he kept making adjustments on the fly.
"So this guy, Terence Crawford, is going to be tough, a tougher fight, in my opinion, than Manny Pacquiao."
After also sharing 36 rounds with Pacquiao, Bradley is in prime position to judge how the Filipino operates compared to Crawford.
"I mean, completely two different styles. I'll give Horn the benefit of the doubt, because what he was able to do Against Manny Pacquiao, I haven't seen anybody be able to dominate him and bully him the way he did. And when I say dominate, I just mean in the physical form.
"You know, he pushed him back. He was grinding there, and he was very dirty at times. He had Pacquiao's back against the ropes and he was working him.
"I haven't seen that -- a guy do that Against Manny Pacquiao at all, and he was able to do that. With that being said, this is a completely different guy. Styles make fights.
"Terence can fight from the forward and backing up. Terence can switch left-handed and he can go right-handed.
"He can knock you out with his left hand and his right hand. This is a kid that can make adjustments on the fly. He has a high IQ.
"If you watch the replay with him and Indongo, you will see Terence punch in between punches.
"If Horn comes rushing in with wide shots, I've sparred him, it's dangerous. It's dangerous for Horn. It's danger. That's all I'm going to say.
So, absolutely. He (Horn) needs to continue to prove himself. Just one fight doesn't justify your career. It's all the other fights in between as well.
"It's the fight after he won the championship Against Manny Pacquiao, you know? It's the next fight after this one, you know what I mean? That's what defines your career. Not one fight," he added.