LAS VEGAS -- With a frenzied crowd chanting and singing, crowd favorite Conor McGregor and Floyd Mayweather, booed in his hometown, came nose to nose after they weighed in Friday afternoon at T-Mobile Arena ahead of their massively hyped junior middleweight fight.
McGregor, the UFC star crossing over to boxing to make his professional boxing debut against Mayweather, an all-time great who is coming out of a two-year retirement for the one-off fight, will meet Saturday (Showtime PPV, 9 p.m. ET).
McGregor was rumored to be having problems getting down to the 154-pound weight limit, but that did not appear to be much of an issue when it was his turn to step on the scale. With Irish fans cheering him on, he weighed 153 pounds and looked in tremendous condition.
"I'm a professional," McGregor said. "I made weight. Look at me. I'm in peak physical condition. I'm ready. I will be a lot bigger than him [on fight night]."
McGregor said he would probably weigh around 170 pounds when he steps into the ring.
Mayweather, who came to the scale to the mellow tune of Phil Collins' "In The Air Tonight" for what he said will be his final fight, looked shredded, weighing in at 149½ pounds, well under the weight limit.
Mayweather (49-0 26 KOs), 40, said he was not concerned about the 29-year-old McGregor's size advantage.
"I've been here before. I know what it takes in a fight of this magnitude," Mayweather said. "Weight doesn't win fights. Fighting wins fights. It won't go the distance. Mark my words."
When asked to reflect on this being his final fight, Mayweather thanked the fans who have supported him through a legendary 21-year professional career and added, "This will be Conor McGregor's last fight also. The fans can't fight for you. It comes down to the fighters."
Despite Mayweather's immaculate condition, McGregor insulted him and yet again promised an early knockout win.
"That's the worst I've ever seen him. Worst shape I've ever seen him in," McGregor said. "I'll stop him in the second round. Let's see who can take it. I see a man afraid. That's it."
Baltimore's Gervonta Davis (18-0, 17 KOs) was supposed to defend his junior lightweight world title for the second time by taking on Costa Rica's Francisco Fonseca (19-0-1, 13 KOs) in the co-feature of the pay-per-view.
However, Davis, who didn't arrive at the arena until well after the main event weigh-in because he was struggling so badly to cut weight, was overweight and stripped of the title. He could only get down to 132 pounds, 2 pounds over the division limit, and that was after taking all the extra time before getting to the arena.
Fonseca weighed in at 130 pounds, and the fight will go on with Fonseca eligible to win the vacant title. If Davis wins, the title will remain vacant. Davis, at 22, had been the youngest active American world titleholder and the third-youngest in boxing.
"I'm young, I'm growing. I had a chance to make the weight. I knew I couldn't make it, and that's that," Davis said. "I will have a belt again."
Secondary light heavyweight titlist Nathan Cleverly (30-3, 16 KOs), of Wales, weighed 174¼ pounds for his first defense, which will come against Las Vegas' Badou Jack (20-1-3, 12 KOs), who weighed 174½ pounds. Jack, the former super middleweight world titleholder, vacated his belt in January to move up to the 175-pound division, and Mayweather, his promoter, was able to secure him the title opportunity.
The opening fight of the pay-per-view will pit Las Vegas cruiserweight up-and-comer Andrew Tabiti (14-0, 12 KOs), 27, against 41-year-old former two-time world titleholder Steve Cunningham (29-8-1, 13 KOs), of Philadelphia, in a 10-round bout. They both made weight and looked in tremendous shape. Tabiti was 197½ pounds, and Cunning was 198 for the 200-pound maximum fight.