Conor McGregor accused Floyd Mayweather of being in "the worst shape I’ve ever seen" after he outweighed the American by almost four pounds at Friday’s weigh-in.
At 153lbs, the Dubliner came in one pound below the light-middleweight limit but significantly heavier than Mayweather, who at 149.5lbs was closer to the welterweight limit at which he has so often excelled.
The American, 40, again cut a noticeably more relaxed figure than the animated McGregor, who on Saturday makes his professional boxing debut at Las Vegas’ T-Mobile Arena.
Similarly to in his 2007 fight with Ricky Hatton, Mayweather was roundly booed in his home city as his 29-year-old opponent’s supporters vastly outnumbered his.
He also again looked in fine shape, and in coming in so light has no doubt prioritised the speed that has contributed so much to his success and is an advantage he is expected to hold over McGregor.
"He’s full of water, that’s the worst shape I’ve ever seen him in," McGregor said after he weighed in at the same venue. "That’s the worst shape I’ve seen in him. He looks out of shape, I’m going to breeze through him.
"I’m a professional, I make weight. It’s about sacrifices, dedication, it’s focus, I make it, and that’s it. I’ve put in the work as everyone can tell. I’m ready.
"(I’ll be) a lot bigger than him (on fight night). Pushing 170lbs, yes.
"You’ll never beat the Irish, and that’s it. Las Vegas is ours now. I’ll stop him in four. Let’s see if he can take it. He’s over there twiddling his thumbs and twitching away."
Mayweather dismissed his opponent’s taunts ahead of what he insists will be his final fight, and defended his decision to remain so light.
"Weight doesn’t win fights, fighting wins fights," the American said, while being booed. "This won’t go the distance, mark my words.
"This is going to be Conor McGregor’s last fight also.
"The fans can’t fight for him. It comes down to the two competitors."
Britain’s Nathan Cleverly earlier tipped the scales at 174.25lbs for the first defence of his WBA light-heavyweight title on the Vegas undercard, while his Swedish challenger Badou Jack, who makes his debut in the division, was slightly heavier at 174.5lbs.