The UEFA Champions League, known simply as the Champions League, is an annual continental club football competition organised by the Union of European Football Associations (UEFA). It is one of the most prestigious tournaments in the world and the most prestigious club competition in European football. The final of the 2012–13 tournament was the most watched UEFA Champions League final to date, as well as the most watched annual sporting event worldwide in 2013, drawing 360 million television viewers.
Introduced in 1992, the competition replaced the European Champion Clubs’ Cup, or simply European Cup, which had run since 1955, adding a group stage to the competition and allowing multiple entrants from certain countries. The pre-1992 competition was initially a straight knockout tournament open only to the champion club of each country. During the 1990s, the format was expanded, incorporating a round-robin group stage and more teams. Europe’s strongest national leagues now provide up to four teams for the competition, and will provide up to five teams from the 2015–16 season onwards.
In its present format, the UEFA Champions League begins in mid-July with three knockout qualifying rounds and a play-off round. The 10 surviving teams enter the group stage, joining 22 other teams qualified in advance. The 32 teams are drawn into eight groups of four teams and play each other in a double round-robin system. The eight group winners and eight runners-up proceed to the knockout phase that culminates with the final match in May The winner of the UEFA Champions League qualifies for the UEFA Super Cup and the FIFA Club World Cup.
The first edition of the European Cup took place during the 1955–56 season. Sixteen teams participated: Milan (Italy), AGF Aarhus (Denmark), Anderlecht (Belgium), Djurgården (Sweden), Gwardia Warszawa (Poland), Hibernian (Scotland), Partizan (Yugoslavia), PSV Eindhoven (Netherlands), Rapid Wien (Austria), Real Madrid (Spain), Rot-Weiss Essen (West Germany), Saarbrücken (Saar), Servette (Switzerland), Sporting CP (Portugal), Stade de Reims (France), and Vörös Lobogó (Hungary). The first European Cup match took place on 4 September 1955, and ended in a 3–3 draw between Sporting CP and Partizan. The first goal in European Cup history was scored by João Baptista Martins of Sporting CP. The inaugural final took place at the Parc des Princes between Stade de Reims and Real Madrid. The Spanish squad came back from behind to win 4–3 thanks to goals from Alfredo Di Stéfano and Marquitos, as well as two goals from Héctor Rial.