- His last name is pronounced "Dukes".
- In 1996, HarperCollins published "The Secret Man: An American Warrior's Uncensored Story".
- His parents, Margaret and Alfred Dux, (born August 7, 1920 and died February 24, 2002) were Holocaust survivors who immigrated from Canada to the United States in 1963.
- He is portrayed by Jean-Claude Van Damme in Bloodsport (1988).
- The film Bloodsport (1988) tells the story of his life.
- Dux claimed to have scored 56 consecutive knockouts in a Kumite Tournament in 1975.
- Dux served in The United States Marine Corps Reserves.
- In 1980, Dux told Black Belt Magazine that his fight record was 321 wins, 1 loss and 7 draws.
- Dux was the International Fighting Arts Association (IFAA) World Heavyweight Full-Contact Kumite Champion from 1975 to 1980.
- At the 1975 Kumite Tournament, Dux set a record by knocking out Mark Sharrock in 12.1 seconds.
- In 2014, Dux told AXS TV that he had retired with a fight record of 329 wins, 0 losses.
- Dux holds the following records in Kumite Tournaments
1975 - Most consecutive knockouts in a single tournament - 56 1975 - Fastest recorded Kumite knockout - 3.2 seconds 1975 - Fastest recorded punch resulting in a knockout - .12 seconds 1975 - Fastest recorded kick resulting in a knockout - 72 MPH 1975 - Shortest knockout time average for fight career - 1:20 sec 1975 - First to achieve IFAA Weapons/Forms score of a perfect "10" 1978 - First Kumite fighter to exceed 300 matches 1980 - First Kumite fighter to be undefeated with over 100 matches 1980 - Final Kumite fight record - 329 matches. (Some sources list 323-1-7).
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