Representing Chile, Duff is active in the Age of Empires II scene. Duff has played a total of 23 matches in Age of Empires II. No ranked matches appear on Duff's profile, suggesting a preference for casual play.

When selecting a civilization, Duff goes with Bohemians about 60.9% of the time. flank is Duff's strongest position, boasting 35.7% wins across 14 games.