International friendly: Brazil 2 Argentina 0
A Lucas-led Brazil eventually broke down Argentina to run out 2-0 winners in a one-sided affair in Belem on Wednesday.
After a 0-0 deadlock in the first leg of the Superclasico de las Americas in Argentina on September 14, the 19-year-old Lucas opened the scoring in the second-half with a dazzling run and finish on the counter, before Neymar sealed the victory with a close-range finish which was scuffled over the line.
Spurred on by a fanatical home crowd, Brazil dominated proceedings throughout the first 45 minutes.
Argentina looked solid at the back, but were pinned in their own half by the hosts and offered little attacking threat.
Sao Paulo's teenage starlet Lucas was in electric form in the first 45 minutes and tortured the Argentine defence with his running from deep.
In the opening stages, he stormed forward before firing just wide, and even a bloody nose following a forearm in the face from Emiliano Papa did not slow him down.
Five minutes before the break, Lucas skipped past his markers to approach the area once more, and he delicately slipped the ball to Hernani Borges on the right.
The powerful forward squared for his Santos team-mate, but Neymar somehow failed to make contact on the ball with the goal begging, ensuring Argentina would hold on to enter the break at 0-0.
Alejandro Sabella's team attacked with a little more purpose after half-time, and Augusto Fernandez came close to giving the visitors a surprise lead. The Velez Sarsfield man smashed the ball to force a save from Jefferson, but seconds later it would be Brazil in the ascendancy.
Argentina were caught hopelessly out of place following a corner, and Lucas was released on a blistering counter-attack.
The youngster easily outpaces the chasing Leandro Desabato and Papa and slotted with assurance past Agustin Orion to score the first goal of the two-game series.
The visitors still came forward in sporadic bursts, and one of the best chances occurring when substitute Mario Bolatti forced a simple save with a weak header.
Brazil, though, looked supremely comfortable, and sealed victory with 15 minutes left when Neymar bundled in from close-range to polish off a fluid passing move - much more fluid in fact than the dancing which followed the goal.
Boca striker Lucas Viatri forced a wonderful save from Jefferson, but it was not enough and Brazil never looked like letting go of the lead.
The win hands Mano Menezes' side victory in the inaugural Superclasico de las Americas series, and is more than welcome for a coach who had seen the pressure build after failing to progress past the quarter-finals of the Copa America in July.