"Discover the top richest boxers of 2023, including Buster Douglas' legendary upset of Mike Tyson. Learn about his 42-1 odds, the 30 for 30 documentary, and his personal life with wife, 4 children, and more. Plus, explore the top 50 richest MMA fighters in 2024, ranging from $2 million to $200 million in net worth. Stay up-to-date on boxing and MMA's wealthiest athletes."