HAKK Mladost

The basketball section of the club was formed in 1946 after its parent club HAŠK Zagreb (which established in 1906 and until 1945 had only football department) fused up to Dinamo Zagreb. However, for HAŠK not to dissolve it founded other departments and renamed it to Mladost (HAŠK Mladost), which in English means "Youth".

In 1948, Mladost participated for the first time in the final tournament of the Yugoslav League held in Belgrade and took the fifth place in a six team group. The next year, it came out as best Croatian basketball team after it was ranked third in the national league behind their Serbian rivals of Belgrade (Crvena Zvezda & Partizan) and above the other Croatian teams such as Jedinstvo (4th) and Lokomotiva Rijeka (9th). The decade of the '50s proved the best in the history of the club, having taken part seven times in the large category of Yugoslavia basketball (1950, 1951, 1952, 1954, 1955, 1956) and specifically in 1954 where Mladost (Brkljačić, Aleksandar Blašković, Petar Mijač, Batalo, Špiljak, coach Mića Orlović) claims until of the end the champions title against this great team of Crvena Zvezda with the consecutive championship wins that period. The absolute zenith of the championship's claims, Mladost was limited to simple participation the next two years and was demoted in 1956. The last glimpse of the team was in 1962, with its participation in the great division, accompanied by an even longer and definitive relegation.