Floyd “Money” Mayweather, Jr. has enjoyed the most successful boxing career ever. He is the wealthiest boxer ever to have lived, reaching an astounding net worth over one billion dollars. Mayweather had a long and prosperous pro boxing career, achieving a total of fifty wins and zero losses. This was done through five different weight classes against multiple world champions. Mayweather ultimately finished his career in an unusual fashion. He came out of retirement to fight the former UFC champion Connor McGregor. This final fight went for 10 rounds and ended in the TKO of the young UFC champion. The fight generated hundreds of millions of dollars and sent a boxing legend into a final retirement. Floyd Mayweather, Jr. has raised the bar of what a professional boxer can achieve, and many fighters will look up to him for generations.