Wikipedia says:-
There was no official World Cup final match in 1950.[40] The tournament winner was decided by a final round-robin group contested by four teams (Uruguay, Brazil, Sweden, and Spain). However, Uruguay's 2–1 victory over Brazil was the decisive match (and also coincidentally one of the last two matches of the tournament) which put them ahead on points and ensured that they finished top of the group as world champions. Therefore, this match is often considered the final of the 1950 World Cup.[41] Likewise, Sweden's 3–1 victory over Spain (played at the same time as Uruguay vs Brazil) ensured that they finished third.