As a member of the senior Polish national basketball team, Łopatka competed at four Summer Olympic Games (1960, 1964, 1968, 1972). He won a silver medal at EuroBasket 1963, and bronze medals at EuroBasket 1965, and EuroBasket 1967. He was a member of the FIBA World Cup All-Tournament Team, at the 1967 FIBA World Championship, and he also led the tournament in scoring.