El Clásico!

This bitter rivalry is regarded as one of the biggest matchups in the world of sports. The two teams meet twice during the Spanish La Liga season, with an additional two times in the Copa del Rey, the UEFA Champions League, the Supercopa de España, and possibly in the UEFA Super Cup as well. These two clubs are among the richest and most successful football clubs in the world; in 2014, they were ranked the world’s two most valuable sports teams. Both clubs have a global fan base; they are the world’s two most followed sports teams on social media