Mezue ahịrịokwu na-esonụ: Na 22 June 2018, Dahlin bụ onye mbụ nke mbụ site na Buffalo Sabres na Draft. Ọ bụ onye ọkpụkpọ Sweden mbụ a họpụtara n'isi mbụ kemgbe Mats Sundin n'afọ
1989, na onye Sweden nke abụọ n'ime ndị niile rụzuru ọrụ ahụ. Na July 9, ọ bịanyere aka na afọ atọ, nkwekọrịta ntinye na Sabres. Dahlin sonyere na ogige ọzụzụ nke Sabres ma mee ka ndị na-emeghe abalị maka oge 2018/19. O mere NHL mbụ ya na Ọktọba 4 na mmeri 4-0 na Boston Bruins. Dahlin dekọtara ihe mgbaru ọsọ mbụ ya na NHL na October 13 na mmeri 3-0 na Arizona Coyotes. Na 9 Febụwarị 2019, mgbe mmeri meriri Detroit Red Wings, Dahlin ghọrọ onye agbachitere nke ise na akụkọ NHL iji dekọọ akara 30 tupu afọ 19. Mgbe oge rookie ya gasịrị, akpọrọ Dahlin dị ka otu n'ime mmadụ atọ ikpeazụ maka Calder Memorial Trophy dị ka onye rookie kacha elu na NHL.