 Bröckl enjoyed great success as a junior.At the 2003 Junior World Championships in Komatsu, Japan he won a K-2 1000 m gold medal Lieven Spur partnering and the K-1 500 m silver medal, behind Portugal's Emanuel Silva.In 2004 he dominated the Junior European Championships, winning three gold medals (K-1 500 m, K-1 1000 m and K-4 500 m).