Leon Spinks: $400,000
Leon Spinks, whose boxing career began over 40 years ago, managed a remarkable feat by defeating Muhammad Ali professionally within a year of his debut. However, Ali emerged victorious in their rematch, showcasing his superior training. Notably, Spinks served in the Marine Corps from 1973 to 1976. Despite his boxing achievements, Spinks's net worth today is approximately $400,000, considerably lower than many other boxers on this list.
