Champion Floyd Mayweather Jr tipped the scales right on the 147-pound limit on the eve of his WBC welterweight title fight with Britain's Ricky Hatton.
Challenger Hatton was two pounds lighter at the weigh-in held at the MGM Grand Garden Arena, the site of tonight's bout, in front of a crowd of 6,000 almost exclusively British fans.
The two fighters stood nose-to-nose after the weigh-in with Hatton waving the American away as he took the microphone to tell his fans: "What can I say for a turnout like that?"
Members of the raucous crowd, who sang soccer chants plus several renditions of "There's only one Ricky Hatton", had queued for up to five hours for a chance to catch a glimpse of the fighters yesterday.
The 16,800-seat arena sold out within 30 minutes of tickets going on sale for the fight in September and Internet resale sites are offering ringside seats for over €9,000.
More than 10,000 British fans were expected to make the journey to watch the showdown at the arena or at one of several closed-circuit venues along the Las Vegas strip.
Mayweather, who has a 38-0 record, is widely regarded as the best pound-for-pound boxer in the world but Oscar De La Hoya, who was the last man to fight him, believes underdog Hatton, 43-0, has a strong chance of winning the fight.