Maryja Kaslouskaja is a scholarship holder of the Президентский спортивный клуб (President's Sports Club) . She made her international debut as part of the junior competitions of the Summer Biathlon World Championships 2008 on roller skis in Haute-Maurienne . In the sprint she finished 19th and was then 14th in the pursuit race. For the mixed relay she was appointed to the side of Iryna Babezkaja , Jauhen Schuleu and Sjarhej Daschkewitsch in the Belarusian team of men and women, with whom she was fifth Reached place. The next major event was the 2009 European Junior Biathlon Championships in Ufa , in which Kaslouskaja successfully participated. In the individual she was still 31st, she finished tenth in the sprint and was 13th in the pursuit race. With Darja Jurkewitsch and Ala Tolkatsch , she reached second place with the Belarusian relay behind the representation from Russia and thus won the silver medal.