Born in Gulu, Uganda, Oywello competed for Uganda in both the 1960 Olympics in Rome and the 1964 Olympics in Tokyo.
Achievements
In 1964 boxing in the heavyweight competition he was beaten by eventual gold medal winner, Joe Frazier. In the in Perth, Western Australia, Oywello won a gold medal in the heavyweight competition beating New Zealander, Bill Kini in the final.
