#19: Floyd Mayweather Jr.
Floyd Mayweather is next on our list, with a net worth of 450 million USD. Like his father before him, he is a famous and wildly successful professional boxer; when he left the sport in 2017, he had an undefeated record and had won 15 World Championships.

Forbes magazine has frequently ranked him as the highest-paid athlete in the world. With wealth like that, he can afford to blow a lot of money… And he does. Reports say that his designer watch collection is worth more than 6 million USD, that he once bet 5.9 million USD on a Miami Heat game, and that just this summer, he dropped 7 million USD at a Gucci store in South Africa.