In what will be the first Copa finals showdown between them since 1991, the Brazilians have a chance to gain a foothold on a tournament historically dominated by Argentina.
Argentina could earn a record 15th Copa America title with a victory on Sunday. Argentina, along with Uruguay, is the winningest team at the tournament.
Brazil, meanwhile, could clinch the team's seventh Copa title in what will be the ninth Copa finals between both teams.
Sunday's championship game, however, will not feature many of the top names from either team.
Brazil will be without Real Madrid stars Ronaldo and Roberto Carlos, AC Milan playmaker Kaka and Ronaldinho of FC Barcelona. Brazil coach Carlos Alberto Parreira decided to rest them all after their grueling European seasons.
AC Milan's Hernan Crespo, Juan Sebastian Veron of Inter Milan, and Real Madrid's Walter Samuel also opted to rest for Argentina.
At this year's Copa, Argentina has still relied on a core of its A-team players who compete regularly during World Cup qualifying, while Brazil has turned to a squad composed primarily of second-stringers.
Nevertheless, for players and coaches from both teams, it's only winning that matters in any Argentina-Brazil showdown.
"If they have brought their B team, I don't think that's important," said Argentina coach Marcelo Bielsa. "That certain players aren't here isn't what obligates us to win, those feelings arise from our own desire to win."
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