Soon after, in May 1970, the senior Yugoslav national team won the 1970 FIBA World Championship, resulting in an explosion of popularity for the sport throughout the country—a trend young Radovanović followed by beginning to practice a lot more seriously.

Radovanović contributed with 13.8 points per game, as the Yugoslav team — featuring Branko Skroče, Mihovil Nakić, Andro Knego, and Rajko Žižić, among others — won gold.

In July 1975, Radovanović, still only eighteen-years-old, made his full squad senior Yugoslav national team debut in a game versus Canada at Hala Pinki as part of the International Cup.

[5] Working under the club's owner and president Nebojša Čović, Radovanović handled player personnel issues—helping FMP Železnik become a noted producer of basketball talent.

However, instead of keeping the Cup-winning squad (that consisted of somewhat older players) intact, the club decided to sell them and turn to bringing up a generation of 17 and 18-year-olds from its youth system into the first team.

The news of his return even got announced by the Serbian press outlets,[8] however, nothing came of it in the end with Radovanović later revealing that negotiations with KK Partizan lasted over a month with no deal ultimately being made.