1. Floyd Mayweather
Mayweather earned $300 million in 2015, which places him head and shoulders over his competition. No athlete has ever figured out how to monetize themselves as well as “Money Mayweather” has, as he is closing in on $1 billion in career earnings.
He is claiming to have retired at the present time, but those closest to him believe that he will be lured from him current seclusion when the right offer comes along. Rumors continue to abound about an upcoming fight between Mayweather and MMA superstar Connor McGregor, although the feasibility of this potential match remains to be seen.