It is arguably the football world's greatest rivalry: El Clasico. Barcelona vs. Real Madrid.
The two giants hate each other for all sorts of reasons, but for neutrals who have not pledged their allegiance to either team, watching Spain's two best teams play for the pride of their fanbases is superb theater.
Barcelona and Madrid are also two of the best teams on the planet in the UEFA Champions League arena. The Catalans have won two of the competition's past three iterations, and Los Blancos have won the world's most prestigious club competition a record nine times.
With both teams in sublime form and seemingly ready to obliterate any opposition who dares to challenge them, it looks almost certain that they will meet in the final of this year's Champions League.