Boca Juniors to face Sao Paulo in Copa Sudamericana 2026 quarterfinals

The round of 16 is still being sorted out, but the road to the final in Barranquilla is already starting to take shape. The 2026 Copa Sudamericana is heading into its decisive stretch, and the quarterfinal schedule already offers a few certainties, even if the full bracket isn't locked in just yet.

What is clear is the criterion that will determine the pairings: the teams that finished atop their groups in the opening phase will have the advantage of hosting the second leg. That's no small detail in a round where every series is decided by goal difference or, in the event of a tie, by penalty kicks.

Among the matchups already taking shape is one with plenty of name recognition for fans in both Argentina and Brazil: Boca Juniors will face Sao Paulo. The first leg is set for Buenos Aires, at La Bombonera, while the return leg would be played in Sao Paulo, at the Morumbi, the fitting venue since the Brazilian club finished first in its group.

Tentative dates, pending official confirmation

According to the schedule the organizers are working with, the first legs of the quarterfinals would be played between September 8 and 10, with the second legs set for a week later. Still, that timeline should be treated with caution: CONMEBOL has yet to make the kickoff times or final venues official, something that usually isn't settled until the round of 16 wraps up.

That detail is key to understanding why the full quarterfinal schedule remains incomplete. Until every round of 16 qualifier is known, the rest of the bracket simply can't be filled in. What does stay fixed is the tournament's golden rule at this stage: whoever topped their group closes out the series at home.

For Boca, the matchup with Sao Paulo carries an extra edge. These are two clubs with a recent history in international competition and fan bases that tend to pack their stadiums for occasions like this. Hosting the first leg at La Bombonera gives the Argentine side a chance to build a meaningful lead before traveling to Brazil, where it will need to close out the series at a Morumbi that promises a demanding atmosphere.

With the round of 16 still being finalized, the rest of the quarterfinal matchups will come into focus in the coming days. What won't change is the ultimate goal: a spot in the Sudamericana final, which this year will be held in Barranquilla.