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Started his career in his native Split with Jugoplastika (Yugoslavia). In 1990 was under contract with the Boston Celtics, who drafted him previously, but a court decision canceled the contract and as a free agent in july 1990 signed for Pallacanestro Virtus Roma, for the highest amount ever in Italy. After 3 seasons in Rome, on July 1993 signed for the Boston Celtics where he played up to june 1997 when was traded to the Philadelphia 76ers, but the trade didn't go through and he was later released by the Celtics. As a free agent he then signed, in 1997-98, for Panathinaikos Athens in Greece and, on June 1998 renewed his contract also for the 1998-99 season. Signed for the 1999-00 season by KK Zadar (Croatia). The following season, 2000-01, joined Olympiakos Piraeus (Greece) and in 2001-02 he played, from December and in the Euroleague only, with KK Cibona Zagreb (Croatia). Has been released in early January as the team failed qualification to Euroleague's second round.

Won 2 Euroleagues in 1988-89 and 1989-90 with Jugoplastika Split (Croatia). With Virtus Roma (Italy) he won the Korac Cup in 1993. Has been Top Rebounder of the Greek League in 1997-98. With the National team of Jugoslavia, won the silver medal at the 1988 Olympics in Seoul,as well as 2 gold medals at the European championships in 1989 (Zagreb) and 1991 (Rome). After the Yugoslavian war and the independence of Croatia, he won a silver medal at the 1992 Olympics in Barcelona. Played the FIBA 1997 Eurostars and was also selected in 1999 but did not played due to an injury. Won the 1997-98 and 1998-99 Greek Championships with Panathinaikos Athens. Played the 2000-01 Greek League All-Star Game. Led the Greek League in rebounding (11.7 rpg.) in 2000-01.

Great body, great athletic skills, great coordination and mobility. In sum: great! Definitely the top big man in Europe as for athletic abilities. Nobody so big runs so well and can move so quickly in short spaces.

A complete player, has excellent low post moves. Can make the power move or the turn around jumper. Radja can also step out and face the basket. Has range and can fake and put the ball on the floor for the drive.

A tough defender, mean, if he must make a foul, he's gonna make it hard. Excellent rebounder and shot blocker.

Radja is the best big man in Europe today. He came back fro the NBA bigger and quicker (if possible..). Has also made his skills more consistent, and has become even more self-confident. Sometimes seems to be kind of "annoyed", but when it counts, he makes the difference.