The competition Marathon Duo 2 x 21x1km will be retitled in International Championship Marathon Duo. The organizers would like to point out the international character of the event. More than 30 different nations have been yearly participated at Lübeck Marathon until 2019. Denmark, Sweden, Poland, and Germany are the dominating countries. The categories Women, Mixed and Men will be awarded, and the changeover will take place in Travemünde at the lighthouse.