Roubanis was a member of the Panellinios Basketball Club and its famous 1950s era "Golden Five".
Greek national team
Roubanis was also a member of the senior men's Greek national basketball team. Roubanis competed at the FIBA EuroBasket 1951 and the 1952 Olympics Basketball Tournament with Greece's national team. He finished his national team career with 25 caps, in which he scored 275 points for the Greek national team.
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