Boxing champion Floyd ‘Money’ Mayweather steps into the ring with IRS over $7.3M tax lien. Juke your own tax knockout Thomas Kent 7 min read Moneywise and Yahoo Finance LLC may earn commission or revenue through links in the content below. 1996 Olympic bronze medalist Floyd "Money" Mayweather Jr. built one of the most lucrative careers in sports history, reportedly earning more than $1 billion (1)...