Floyd Mayweather has disputed claims that Saul 'Canelo' Alvarez is boxing's pound-for-pound king, stating the crown should be given to Terence Crawford.
Undefeated Mayweather, 44, recorded a comprehensive victory over Canelo in 2013, when the Mexican was 22 years old.
His former opponent has gone on to win world titles at middleweight, super middleweight and light heavyweight since then.
When the bout was in development, Mayweather was asked about Canelo's rank as pound-for-pound king.
The American said: "It's a couple of guys that's up there in pound-for-pound.
"I'm not just saying this because [I promote him]. The most exciting fighter right now is Gervonta 'Tank' Davis, he's the most exciting.
"22-0 with 21 knockouts, hands down Gervonta Davis is the most exciting fighter right now.
"And pound-for-pound I would have to say Terence Crawford. Crawford is the number one guy pound-for-pound."
Crawford is the WBO world champion at welterweight, having gone undefeated in 37 fights (28 KOs).
It's hoped that the southpaw will take on fellow American Errol Spence Jr, who holds the WBC and IBF world championships in the same division and is also undefeated.
'Money' was then asked about the UK scene, to which he replied: "Don't you guys have Kell Brook. He's a hell of a fighter.
"Billy Saunders is from the UK also. I think Brook is one of the best fighters from the UK and I think Saunders is one of the best fighters from the UK."
Speaking about Saunders' chances against Canelo, Mayweather continued: "Anything can happen in this sport…
"In my fight with Canelo, I used certain angles - Canelo, I can tell he's been watching my tapes, he's been studying my moves.
"Canelo fought GGG, he beat [Sergey] Kovalev, so he's making a lot of noise in the sport. I don't want Saunders to overlook Canelo.
"I think it's gonna be a hell of a fight."
You can watch Canelo v Saunders on DAZN, with the fighters expected to appear for their ringwalks at around 4am (GMT) on Sunday morning.