Eriksson made his first run for a junior world championship title when he was sixteen at the 2008 World Junior Curling Championships, skipping his first team to a silver medal. The team, consisting of Henric Jonsson, Markus Franzén, and Nils Karlsson, lost in the final to the US team skipped by Chris Plys. In 2008, Eriksson moved to Härnosand to join other promising curlers at Härnosands gymnasium. He also joined Team Lit/Lindström, formed by brothers Kristian Lindström and Alexander Lindström, together with Christoffer Sundgren and Henrik Leek. The team had immediate success on the junior tour and also scored wins in the senior division. With this team, Eriksson made his second run for the gold medal at the 2009 World Junior Curling Championships, but finished in fourth place, losing in the bronze-medal game to the US team that was again skipped by Plys. Though the team did not qualify to compete at the championships in 2010, Eriksson and his teammates finally won a gold medal at the 2011 World Junior Curling Championships, defeating Team Switzerland, skipped by Peter de Cruz, by a score of 6–5 in the final.