An intelligent and clever playmaker, Radivojevic spent the 1997-98 season with Dukla Trencin of the Slovakian Junior League and played one game with Dukla Trencin of the Slovakian League before making his North American debut in 1998-99.

In his first season with the Bulls, the Piestany, Slovakia native led all Belleville rookies in scoring and finished 8th among all OHL rookies. Belleville's Rookie of the Year, Radivojevic finished with 58 points (20 goals, 38 assists) in 68 games before notching 72 the following year.

In his final season in Belleville, Radivojevic established personal bests with 34-70-104 in 61 games and was a First Team OHL All-Star. His 104 points ranked third in the entire OHL behind only teammates Kyle Wellwood (118) and Jason Spezza (116).

On the international stage Radivojevic was a member of the 1998 Slovak Under-18 National Team and a member of Slovakia's 2000 World Junior Team.

Following his third season in Belleville, the Phoenix Coyotes signed Radivojevic as a free agent prior to the 2001-02 season. In his first year of professional hockey in 2001-02, Radivojevic spent the majority of the season with the Coyotes AHL affiliate in Springfield where he tallied 39 points (18 goals, 21 assists) in his rookie campaign while playing in a 18 games with the parent club.

Radivojevic had a solid 2002-03 campaign with the Phoenix Coyotes, allowing him to stay with the club for the entire season before being dealt to the Philadelphia Flyers along with veteran netminder Sean Burke for Mike Comrie following the 2004 NHL All-Star game.

Radivojevic would spend a season and a half with the Flyers who would allow the right winger to sign as a free agent with the Minnesota Wild in the summer of 2006.

Aside from his World Junior experience, Radivojevic has gone on to represent his homeland at the 2003 World Championships and the 2004 World Cup of Hockey.