How these richest boxers rake up millions of dollars in a match? Boxing is a known combat sport involving two people wearing protective gloves and throwing punches at each other in a boxing ring. When you say professional boxing, it is a regulated, sanctioned sport that involves a purse that is divided between two boxers as stipulated in the contract. Most of the boxers started out to train boxing as early as five years old. After their rigid training on the ring, they would eventually join amateur boxing competitions to start off their career. The estimated training time of a professional boxer before a boxing competition is between thrice a week and three to six months. Some of them started out as a light heavyweight boxer before earning their WBO Heavyweight championship belt. There are some boxers who aspire to become professional, but they end up participating in qualifying tournaments for the Olympics. Most of these energetic boxers fill up the slots for 250 male in ten weight classes and 36 female in three weight classes, which led them to represent their country. How these athletes earned from boxing? Aside from getting the purse money from the boxing bout, there are professional boxers such as Oscar De La Hoya, Manny Pacquiao, and Juan Miguel Marquez earned from several product endorsement deals, HBO Pay-Per-View profits, and business ventures. Some of the successful boxers include Sugar Ray Leonard, Muhammad Ali, Miguel Cotto, Timothy Bradley, David Diaz, and Joshua Clottey who were able to maintain their spots on our list of richest boxers.