25 Sports Celebrities Who Redefined Athletic Endorsements

13. Floyd Mayweather

Mayweather is the premier boxing champion of the modern era, and every fight that he attends attracts millions of viewers. Furthermore, what happens when millions of viewers watch his matches? The companies that organize them make millions of dollars. And he has earned over one billion dollars by playing this game well. 

Mayweather makes more than enough money in his fights, but he still endorses several brands, most notably Swiss luxury watchmaker Hublot. Getting him to support a brand has a high barrier to entry given that his price is far too high for most companies to afford.