Mezue ahịrịokwu na-esonụ: Gytis Masiulis mere ntorobịa mbụ ya maka Lithuania na 2014 FIBA Europe Under-16 Championship na Latvia. O ritere ọla nchara na Lithuania na 2015 FIBA Europe Under-18 Championship. Otu afọ mgbe nke ahụ gasịrị, o meriri nrite ọlaọcha na 2016 FIBA Europe Under-18 Championship na Turkey. N'afọ 2017, Masiulis nọchitere anya Lithuania na
2017 FIBA Under-19 Basketball World Cup.