Born in Split, Croatia, in 1967, Radja developed a passion for basketball at a young age. Standing at a commanding 6'11", he possessed a rare combination of strength, agility, and shooting touch. His talent blossomed in his native Yugoslavia, where he became a key player for KK Jugoplastika (later Split). Under the legendary coach Željko Obradović, Radja honed his skills, becoming a dominant force in the European league. He helped Jugoplastika win three consecutive EuroLeague championships (1989, 1990, 1991), earning the EuroLeague Final Four MVP award in 1989. His signature post moves, powerful dunks, and surprising shooting range made him a nightmare for opposing centers.

Radja's international career was equally impressive. He led the Yugoslavian national team to a silver medal at the 1992 Olympic Games in Barcelona, showcasing his talent on the world stage. But it was his on-court partnership with his close friend Dražen Petrović that truly captivated, a beautiful, potent combination of power and finesse that left fans in awe.

In 1993, Radja decided to test his skills in the NBA, joining the Boston Celtics. Despite facing an adjustment period due to the faster pace and physicality of the American game, Radja displayed flashes of his brilliance. His ability to score in the paint and rebound effectively earned him not just respect, but admiration from his peers, with legends like Dennis Rodman acknowledging the challenge he posed. However, injuries hampered his NBA career, and he returned to Europe after two seasons.

Back in Europe, Radja continued to dominate. In 1998, he won the Greek League championship with Panathinaikos BC, further solidifying his reputation as a winner. He remained a force to be reckoned with until his retirement in 2003, leaving a legacy of dominance and resilience.