A match of such epic proportions that football fans worldwide watch in droves, regardless of who they support.
As a spectacle it very rarely lets us down, and there is always something to play for other than bragging rights.
Sunday night's game was no different.
A win for the hosts would see them seven points ahead of their biggest rivals, whilst three points for the visitors would blow the La Liga title race wide open once more.
Let's take a look at six things we learned from the game.