Kid Chocolate
A Cuban boxer, Kid Chocolate fought in 152 matches and won 136 of them, 51 of which by KOs. He claimed the world junior lightweight championship but then lost it to Frankie Klick in 1933. Shortly after he lost his title he retired but returned to the ring in 1934.
Willie Ritchie
The world lightweight champion from 1912 to 1914, Willie Ritchie began his boxing career in 1907. Out of the 80 matches he participated in, he won 48 of them, 8 of which by KOs. He retired in 1927 and became the chief inspector for the California State Athletic Commission.