The following season, 1998–1999, Bradley debuted on the ISU Junior Grand Prix. He won medals at both his events. At that time, the World Junior Championships were held before the U.S. Championships. At the Junior Worlds selection competition, Bradley placed second and was placed on the team for the 1999 Junior Worlds, where he placed 10th. At the 1999 U.S. Championships, he won the Junior title. He competed at the Gardena Spring Trophy following Nationals and won the competition.