Tom Barth starts for the TuS Dippoldiswalde 1992 e. V. He made his international debut at the 2010 Junior World Championships in Torsby , where he won bronze medals in singles and sprints and was ninth in the pursuit. With Johannes Kühn , Benedikt Doll and Manuel Müller , he also won the relay race title. A year later he won the title again in Nové Město na Moravě with Steffen Bartscher , Doll and Kühn. Was it still the start in 2010 - it was now the final runner. In the individual, he missed a top ten position for the only time so far, finishing eleventh. In the sprint, he won his first title in a single race and was also third in the pursuit competition. At the European Biathlon Championships in 2011 in Ridnaun , he was initially used for the individual in the juniors and came in fifth there. In the sprint, Barth was used for the men, finished tenth in the sprint and just barely missed a medal as fourth in the pursuit.