The long-awaited weighin for Mayweather-Marquez showdown finally took place at 3:15 p.m. Pacific Time at the MGM Grand's Garden Arena, the site for Saturday's 12-round welterweight fight. Floyd Mayweather Jr. weighed in at 146 pounds, his usual weight for the welterweight limit. Juan Manuel Marquez tipped the 142 pounds, just two pounds over the junior welterweight limit.