On March 1, 2018, as the first Polish biathlete, she won the title of Junior World Champion in the 12,5 km individual competition with a winning time more than 3 minutes ahead of the 2nd place Biathlete.[4][5] Two days later, she claimed another gold medal, this time in 7.5 km sprint ahead of Czech Markéta Davidová and French Myrtille Bègue.[6] On March 4, 2018, Żuk added silver medal to her achievements from 2018 Junior World Championships in 10 km pursuit, losing only to Czech Davidová at a loss 28.1 sec.[7]