The Superclasico between River Plate and Boca Juniors is one of the biggest matches in world, and the Copa Libertadores final is one of the biggest matches in football.
When the two coincide, as they have done this year, it is an event of almost unprecedented magnitude.
On Saturday, the pair will play the second leg of the Libertadores final after a 2-2 draw in the first match, and ahead of that match, Boca held an open training session at La Bombonera.
Punches and tear gas: Boca Juniors players clash with police about Libertadores loss
Fans came out in their numbers.
This is an astonishing display from their supporters.
Midfielder plays in goal but River win in Copa Libertadores
River Plate set to put a midfielder in goal for Copa Libertadores tie - reports