Duffy was a semifinalist (top 17) in the 100 metres at the 1908 Olympic Games, winning the first heat with a time of 11 3⁄5 seconds. Duffy took third place in semifinal 3, losing to James Rector, the eventual silver medalist.
- Cook, Theodore Andrea (1908). The Fourth Olympiad, Being the Official Report. London: British Olympic Association.
- De Wael, Herman (2001). "Athletics 1908". Herman's Full Olympians. Retrieved 14 July 2006.
- Wudarski, Pawel (1999). "Wyniki Igrzysk Olimpijskich" (in Polish). Archived from the original on 16 February 2009. Retrieved 24 July 2006.
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