This taken from Fight News:

On Friday, Mayweather had to cough up $600,000 after failing to make the bout weight of 144 pounds by coming in at 146. Marquez came in weighing 142 pounds – 12 pounds more than his usual 130 pound fight weight – and the difference was evident from the opening bell. Mayweather refused to weigh himself again before the fight so the world will never really know how much of a size advantage he had.


Quotes from Marquez:

“I’m a little upset but I tried my best. The weight was a big problem. I think there was a 20 pound difference in weight,” Marquez said after the fight. “I’m not trying to make excuses. I came to fight twelve hard rounds and a lot of people thought I was going to get knocked out.”