Anderson Silva
Many people consider Silva to be the greatest UFC fighter of all time. The Brazilian star brought sublime striking skills as well as an elite IQ to the sport. However, age finally caught up with Silva and he began losing against inferior fighters. Finally, he departed from the UFC but this didn’t signal the end of his combat career.

Silva entered the world of professional boxing and quickly built up an unbeaten record. He defeated fellow MMA veteran Tito Ortiz before beating a bonafide champion in Julio Cesar Chavez Jr. But freak shows offer a lot of allure and he agreed to fight Jake Paul in one of the Youtuber’s pay-per-view events (via Mirror).