Without question the two biggest club sides in world football in the modern era, Real Madrid and Barcelona have a rivalry that is unmatched in terms of intensity and quality of football. The two clubs boast many of the world's greatest players, and their meeting on Saturday will be watched by hundreds of millions of fans. Alongside some moments of magic, El Clasico is a fixture that throws up entertainment throw its feistier side as well. Ahead of Saturday's showdown, Sportsmail takes you back through the most shocking games in the history of the great rivalry. In the two-legged semi-final of the Copa del Generalisimo, Barcelona had taken a 3-0 lead in the first game at the Nou Camp. Before that game there was not a great rivalry between the two teams, but what followed made sure there would always remain one.Real Madrid and Barcelona have the most intense rivalry in EuropeThe two clubs have come to dominate the European gameFrom Alfredo di Stefano to Johan Cruyff and then Luis Figo, transfers have fuelled the bad blood between the sidesSportsmail brings you the 10 most shocking fixtures between the sides
The upshot was a massacre on the pitch, with Barcelona hammered 11-1, but it is not a game remembered all too often in _, despite being their record ever victory. Messi fully announced himself as a world beater with a hat-trick against Real, equalising three times after _ had taken the lead, as 10-man Barca earned a valuable point.