The 36-year-old Mayweather (44-0, 26 KOs) weighed 152.2 pounds and the 23-year-old Alvarez (42-0-1, 30 KOs) went 157.4 pounds.
A fierce redhead steamrolling toward greatness, Alvarez most recently vacated the squared circle on April 20 after outscoring Austin Trout to unify the WBC and WBA super world light middleweight titles.
Displaying dazzling head movement, Alvarez landed thunderous blows throughout the 36 minute affair and floored Trout (26-1, 14 KOs) with a powerful straight punch to the kisser early in the seventh round.
Conversely, in an utterly brilliant showing, Mayweather earned a unanimous decision triumph over an outclassed Robert Guerrero on May 4.
Defeating Miguel Cotto to acquire the WBA (Super) & WBC Diamond light middleweight crowns in May 2012, Mayweather is a five-division, eight-belt capturer and one of the premier performers in the annals of pugilism.
A defensive virtuoso defying Father Time with an incredible work ethic, the reigning pound-for-pound king should adapt to Alvarez’s bruising techniques.
Possibly of greater importance, Mayweather is already in peak condition and Alvarez must lose six pounds in seven days.
Many onlookers will claim shedding such weight within a span of a week is a simple and routine task.
However, having not weighed below 153 pounds since seizing the WBC light middleweight strap from Matthew Hatton in March 2011, Canelo could be spent when the bell rings.