Konplete fraz sa a: Karlsson te kapten ekip la Swedish nan 2013 Ivan Hlinka Memorial Tournament, ak te genyen yon meday an ajan jwe ak Ekip la Syèd nan 2013 Ivan Hlinka Memorial Tournament, ak te genyen yon meday an ajan jwe ak Ekip la Syèd nan 2013 Ivan Hlinka Memorial Tournament, ak te genyen yon meday an ajan jwe ak Ekip la Syèd nan 2013 Ivan Hlinka Memorial Tournament, ak te genyen yon meday an ajan jwe ak Ekip la Syèd nan 2013 Ivan Hlinka Memorial Tournament.
2014 Mondyal Junior Ice Hockey chanpyona.