Morseu played for the Australian team at the 1980 Summer Olympics in Moscow, where Australia finished eighth, and at the 1984 Summer Olympics in Los Angeles, where Australia finished seventh, their best Olympic result to that date. He was the first Torres Strait Islander to represent Australia at the Olympic Games. He also played twelve world cup matches for Australia.
A Torres Strait Islander, Morseu was born in 1958 on Thursday Island in Far North Queensland. He spent his childhood in Tamwoy, a mission on Thursday Island, where he grew up without running water or electricity. He started playing basketball at school and despite being cut from his primary school team, he developed into a tall talented teenage athlete. After completing school he moved to Cairns where he played basketball and rugby league for local teams.
Morseu attracted the attention of National Basketball League coach Brian Kerle after playing a match against Kerle's club, the Melbourne-based St Kilda Saints – on tour of North Queensland. Kerle convinced Morseu to move to Melbourne in 1978, where he played in St Kilda's championship winning teams of 1979 and 1980. He played 217 NBL games in total, winning another NBL championship with the Brisbane Bullets in 1987.