Slovenia played its first game in 1992 against Estonia during the Pool C qualification tournament of the 1993 IIHF World U20 Championship.

During the same tournament Slovenia also achieved their largest win in international participation after they beat Greece 30–1.

However a format change for the 1995 IIHF World U20 Championship meant that Slovenia who finished last in the Pool C1 Qualification tournament moved on to the newly formed Pool C2 tournament.

[2] During this tournament Slovenia had their worst defeat in international participation after being beaten by Kazakhstan 0–11.

[4] Kopitar competed in three IIHF World U20 Championship for the Slovenian under-20 team from 2004 to 2006 with his best result in 2005 where he scored 10 goals and three assists in the Division I Group B tournament at the 2005 IIHF World U20 Championship.