Prior to this, Martinsson had won two individual world championship medals: a silver in 50 metre running target mixed at the 2002 ISSF World Shooting Championships and a bronze in 10 metre running target mixed in 2008. He also participated in the last Olympic running target competition which was held in 2004, reaching the final and finishing fourth, missing the bronze medal by 0.3 points. At the 2006 ISSF World Shooting Championships he failed to win an individual medal, but was part of the Swedish team that won medals in all four team events (one silver and three bronze).