Alvarez slightly heavier than Floyd
Floyd Mayweather weighed in 0.86 kg lighter than Saul Alvarez for their fight on Saturday night.
The American multi-division champion, on the verge of fighting twice in the same calendar year for the first time since 2007, weighed 68.26 kg.
The boisterous crowd of about 12 000 that squeezed into the MGM arena in Las Vegas on Friday cheered loudly when Alvarez was on the catchweight mark of 68.94 kg a day ahead of their 12-round title bout.
The WBC and WBA light-middleweight titles held by Alvarez were at stake in a tournament broadcast live on SuperSport 6, HD 6 and M-Net.
Alvarez had not weighed 69 kg or less for a fight since 2011. Mayweather had fought above 66.7 only twice. That was when he beat Oscar de la Hoya and Miguel Cotto.
Alvarez said on Wednesday he had been sparring at 70.3 kg but felt comfortable moving down to fight Mayweather.
Mayweather, the highest paid sportsman in the world, and the Mexican had never lost as professionals. The 36-year-old Mayweather stood at 44-0, with 26 knockouts and Alvarez boasted a record of 42-0-1, with 30 wins inside the distance, as they gloved up for the bout.
The fight was the second in Mayweather's six-bout, 30-month contract with American cable network Showtime that could pay him more than $200 million.
After Mayweather beat Robert Guerrero in May, he said he wanted to fight again in September. His guaranteed purse to fight Alvarez was reported to be a record $41 million, which surpassed the record of $32 million he received for fighting Guerrero.
The promoters were hoping the fight would eclipse two million pay-per-view sales.