Blatskauskas was a member of the senior Brazilian national basketball team that won gold medals at the 1959 FIBA World Championship, and the 1963 FIBA World Championship. With Brazil, he also won a bronze medal at the 1960 Summer Olympic Games. He also won the following medals: a bronze medal at the 1959 Pan American Games, a silver medal at the 1963 Pan American Games, gold medals at the 1958 FIBA South American Championship and the 1961 FIBA South American Championship, and a gold medal at the 1963 Summer Universiade.