There was no time for Argentina to respond as they fell to their first defeat with Scaloni at the helm, leaving Brazil still ideal since the World Cup and now having kept 23 clean sheets in their 30 matches under manager Tite.
"Scoring a goal against Argentina is always gratifying and always exciting", Miranda said.
The game was played in the heat of the King Abdullah Sports City and the conditions contributed to a stop-start encounter that included 35 fouls, 21 of them awarded to Brazil.
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Despite the talent on show, though, clear-cut chances were at a premium throughout the contest as an Argentina squad missing Lionel Messi, Sergio Aguero, Gonzalo Higuain and Angel Di Maria largely nullified the Brazilian threat.
Tite's side pushed and pushed as the match ticked towards full time, with a powerful Arthur volley troubling Romero 20 minutes from time and with Richarlison provoking another block from Otamendi as the match entered stoppage time.
"It's always hard, but our team is better than theirs because we've had the same foundations for many years while they're in the process of a drastic renovation", Brazil's full-back Felipe Luis told TV Globo.
The result makes it four wins from four for Brazil since the World Cup, while Argentina fall to their first defeat under caretaker manager Lionel Scaloni. "But I think we deserved to win".