Kosmina's goal in the first ever national league game came against Canberra City at Manuka Oval. West won the game 3–1 in front of a modest crowd of 1700 people. Kosmina, then 20 years old, scored the goal having played two 1978 FIFA World Cup qualification matches for Australia against New Zealand, scoring in one, as well as a cup final for his former club, Polonia.
Kosmina's first goal in the national league occurred against Canberra City at Manuka Oval. West won 3–1 before an audience of 1700 people. At 20 years old, Kosmina scored this goal after playing two 1978 FIFA World Cup qualification matches for Australia and winning a cup final with Polonia.