Brazil and Argentina have won just about every major accolade in world football between them and have boasted some of the greatest players to grace the game. And when they go head-to-head, it's every bit as fiery and unforgettable as you'd expect.
Here's what you need to know, starting with the fact that Brazil v Argentina means Barcelona teammates Neymar and Lionel Messi find themselves on opposite sides of the ball.
1. Neymar vs. Messi
The duo dovetails beautifully for Barcelona but on this occasion and fitness permitting, Lionel Messi and Neymar will be opponents.