Here is the quarterfinal schedule for Copa América. One half of the draw is complete; the other half will be confirmed after the Argentina-Paraguay match tomorrow.
QF1: Venezuela - Uruguay
QF2: Chile - Brazil
QF3: Mexico - Paraguay
QF4: Argentina - Peru
In the semis, the winner of QF1 plays the winner of QF2, and QF3 vs. QF4.
So Argentina and Brazil will be kept apart until the final. The top half of the bracket consists of group rematches -- very odd for the quarterfinal round of a knockout phase. Mexico is most likely hoping for an Argentina victory tomorrow, and Peru for Paraguay. Mexico got their wish, but I think they will find Paraguay to be a challenging rival. Paraguay did beat Mexico in Azteca earlier this year, so there's a revenge factor, too.