In 1949 the club reached Allsvenskan for the first time after defeating Halmstads BK in the decisive game of the season; during this time Swedish leagues were played autumn–spring, on 31 July they played their first game in Allsvenskan against Degerfors IF and lost 2–0, afterward, the later world-famous Gunnar Nordahl claimed that he had seen much worse newcomers, also this year, on 4 September Kalmar faced Malmö FF in front of 15 093 people in the audience; this is still the audience record on Fredriksskans.