Dee ihe na-aga n'ihu maka paragraf a - Mgbe oge rookie ya gasịrị, Mascherin nwetara mkpọsa nke abụọ nke abụọ na isi ihe na nke ọ bụla n'ime egwuregwu iri na otu mbụ ya. Ọ merụrụ ahụ n'egwuregwu nke iri na abụọ n'ime oge ahụ mana ọ laghachiri n'usoro ahụ mgbe egwuregwu ole na ole gasịrị wee gaa n'ihu ịdebanye akara. Ka ọ na-erule ọnwa Disemba, Mascherin bụ onye nke abụọ n'ime ndị otu na-eme ihe mgbaru ọsọ na ihe mgbaru ọsọ 14 na enyemaka 20 wee mechie oge ahụ na ngụkọta nke 81 isi na egwuregwu 61. N'ihi egwuregwu ya, e debere ya n'ọkwa 42 n'etiti ndị egwuregwu North America niile ruru eru maka NHL Entry Draft 2016
site na NHL Central Scouting Bureau. A na-ekwuzi n'etiti ndị scout na Mascherin bụ naanị ọkwa dị ala n'ihi ogo ya. Ọ mechiri oge ahụ na ọtụtụ onyinye ndị otu gụnyere Les Bradley Memorial Award dị ka Onye Ọkpụkpọ Kachasị Mma na Jim Reilly Trophy dị ka Onye Ndú Na-eduzi Team.