Dick Tiger
A Nigerian boxer, Dick Tiger held the world championship for two weight classes. He was named fighter of the year by The Ring magazine in 1962 and 1965. He fought in 82 matches and won 60 of them, 27 of which by KOs.
James J. Jeffries
Powerfully built and athletic, James Jeffries was a world heavyweight boxing champion. He fought in 23 fights and won 19 of them, with 14 of them being KOs. He retired in 1905 but made a comeback in 1910. After he retired from boxing for good, he trained boxers and worked as a fight promoter.