Kammala jumla mai zuwa: A matsayin dan wasan kungiyar kwallon kwando ta Yugoslavia Demšar ya halarci gasar cin kofin duniya ta 1950 da kuma gasar zakarun Turai uku, 1947 a Prague, 1953 a Moscow da
A shekara ta 1955 a birnin Budapest. Ya buga wasanni 79 a tawagar kasa. A lokacin EuroBasket 1947, a ranar 13 ga Mayu 1947 ya zira kwallaye 42 a kan nasarar 90<unk>13 a kan kungiyar kwallon kafa ta Albania kuma ya kafa tarihin cin kwallaye na kasa.