The team, led by him and Martynas Varnas, Laurynas Birutis, won bronze. The trio was invited to play in the FIBA's Youth All-Star Game during EuroBasket 2015. He averaged a double-double with 15.7 points and 10.2 rebounds to go along with 3.8 assists, 1.3 blocks and 1.2 steals per outing en route to a silver medal at the 2016 U18 European Championships in Turkey. Sedekerskis was named to the tournament’s "All-Star Five".