Define a "Duck"

[Thread Stealer]

When you're offered $8milion, a career high payday against the longest reigning champion in the division but you decide to take $5million fighting a lesser opponent. And then you change your name to money.

Where did you get the $5 million figure from?

The reports I've read, from people whom I consider reliable (and some who despise Mayweather), had it at the same amount, $8 mil.