[2] Mazurchuk started his international career when he competed at the 2015 European Youth Olympic Winter Festival in Tschagguns, Austria, where he was 29th in the NH/10 km competition.

At the beginning of his sporting career, Mazurchuk also competed in ski jumping, but those were only FIS Cup competitions.

[4] Mazurchuk debuted at the World Cup on January 13, 2018, in Italian Val di Fiemme where he was 16th in men's team sprint (together with Pasichnyk).

[5] His best personal Continental Cup result remains 8th rank from December 4, 2021, in Chinese Zhangjiakou.

[7] At the 2023 Winter World University Games, Mazurchuk finished 5th in the normal hill/10 km and 7th in the mass start 10 km/normal hill.