A competitor at the 1912 Summer Olympics in Stockholm, Sweden, Cvetko was part of the Austrian sabre team, which won the silver medal, though in the individual foil event he was eliminated in the first round.

He served in the Austro-Hungarian Army between 1900 and 1913, after which he worked as a physical education teacher in the Slovene-language high school in Gorizia.

After WWI, he moved to the Kingdom of Serbs, Croats and Slovenes.

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