South America's top teams went into the group phase of the Copa Libertadores some three months ago and come Thursday night, only eight of them will be left standing. This is the week when the competition defines its quarterfinalists.
One team is already there. Tigres of Mexico have played both legs of their tie against Universitario Sucre of Bolivia and came through 3-2 on aggregate.
The Bolivians put up stiffer resistance than expected but the favourites came through. The same thing may not happen...