 He is 196 cm (6' 5") tall and weighs 100 kg (220 lbs).A 13-year-old Šeškus started his career with BC Rūdupis of the NKL in 2008, scoring four points and grabbing a rebound against BC Alytus.The next season, he became the youngest player ever to debut in the strongest Lithuanian basketball league, the LKL.