Moreover, it's believed he tipped the scales at 172 lbs last April against Austin Trout.
Mayweather, unlike most elite non-heavyweights these days, rarely gains more than 2 or 3 lbs on fight day.
If Alvarez enters at 170 lbs and Floyd is 154 lbs or below, we'll conceivably have a match between a jr middleweight and light heavyweight.
According to BoxingScene, Mayweather stated in response:
"The weight can't fight for you. Actually putting on a lot of weight after the weigh-in can slow you down and make you sluggish."
"Nothing bothers me about no opponent. I can make adjustments better than any other fighter. I truly believe in skills, it's not about the weight, skills pay the bills."
"I don't really listen to what other trainers say. I just focus on what my game plan is, and my game plan is to be smart, be first, and win. Every fighter has a weakness."
"He's a guy who likes to box, he's really young and he's banking on his youth. I have the experience," Mayweather said.
Will Mayweather be able to deal with the young man's size and strength? Should we expect Floyd to use his experience to wear down a fighter whose body has had to adjust to packing upwards of 15-20 lbs of water weight in just 24 hours?