[1] Kovačič was born in Šibenik in 1925 (at the time Kingdom of Serbs, Croats and Slovenes), but moved to Sušak the next year and therefore considered himself a native of Rijeka.

Kovačić was part of the Yugoslav team which was eliminated in the second round of the 1948 Olympic tournament.

In 1956 he was a member of the Yugoslav team which won the silver medal in the Olympic competition again.

He was given the honour to carry the national flag of Yugoslavia at the opening ceremony of the 1956 Summer Olympics, becoming the ninth water polo player to be a flag bearer at the opening and closing ceremonies of the Olympics.

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