MGM Grand, Las Vegas - The weights are in and the fighters are ready to go. On Saturday night at the MGM Grand in Las Vegas, Floyd Mayweather Jr. (44-0, 26KOs) will challenge Saul "Canelo" Alvarez (42-0-1, 30KOs) for the WBA/WBC junior middleweight titles. Mayweather came in at 150.5-pounds, while Canelo was 152-pounds on the catch-weight limit. In the co-feature, both WBA/WBC junior welterweight champion Danny Garcia (26-0, 16KOs) and mandatory challenger Lucas Matthysse (34-2, 32KOs) came in at 140-pounds.