Question: The 2011 Copa del Rey was a specific type of rivalry, given this name to any match between which groups?

full_context: Document 1: List of Real Madrid C.F. seasons: Real Madrid Club de Fútbol is a team who compete in La Liga. The club was formed in 1902 as Madrid Football Club, and played its first competitive match on 13 May 1902, when it lost 3–1 in the semi-final of the Campeonato de Copa de S.M. Alfonso XIII against FC Barcelona. Real Madrid played against other local clubs in various regional tournaments disputed from 1902 to 1940. However, in 1929 the club became one of the founding members of La Liga, Spain's first national league. As of 2014, Real is one of only five clubs never to have been relegated from the top level of Spanish football, the others being Athletic Bilbao, FC Barcelona, Getafe and S.D. Eibar
Document 2: 2016 UEFA Champions League Final: The 2016 UEFA Champions League Final was the final match of the 2015–16 UEFA Champions League, the 61st season of Europe's premier club football tournament organised by UEFA, and the 24th season since it was renamed from the European Champion Clubs' Cup to the UEFA Champions League. It was played at the San Siro stadium in Milan, Italy, on 28 May 2016, between Spanish teams Real Madrid and Atlético Madrid, in a repeat of the 2014 final. It was the second time in the tournament's history that both finalists were from the same city. Real Madrid won 5–3 on a penalty shoot-out after a 1–1 draw at the end of extra time, securing a record-extending 11th title in the competition.
Document 3: 2016 Copa del Rey Final: The 2016 Copa del Rey Final was a football match played on 22 May 2016 to decide the winner of the 2015–16 Copa del Rey, the 114th edition of Spain's primary football cup. It was played at the Vicente Calderón Stadium in Madrid.
Document 4: Real Madrid C.F.: Real Madrid Club de Fútbol (] ; "Royal Madrid Football Club"), commonly known as Real Madrid, or simply as Real, is a professional football club based in Madrid, Spain.
Document 5: Canary Islands derby: The Canary Islands derby is the name given to football matches contesting Spanish sides UD Las Palmas and C.D. Tenerife, who are generally regarded as the top two sides in the Canary Islands. The Canary Islands derby is a match with a lot of rivalry and intensity that has always faced the islands of Gran Canaria and Tenerife and its inhabitants. According to World Soccer Magazine, the Canary Islands derby is on the list of the 50 greatest rivalries in the world and is considered one of the most important and spectacular derbies in Spain. Las Palmas have generally been more successful in derby matches.
Document 6: Liverpool F.C.–Manchester United F.C. rivalry: The Liverpool F.C.–Manchester United F.C. rivalry, also known as the North-West Derby, is a high-profile inter-city rivalry between English professional football clubs Liverpool and Manchester United. It is considered to be one of the biggest rivalries in the football world along with the Old Firm derby in Scotland, Superclásico in South America, El Clásico in Spain, and Derby della Madonnina in Italy, and is considered the most famous fixture in English football. Players, fans and the media alike often consider games between the two clubs to be their biggest rivalry, above even their own local derby competitions with Everton and Manchester City, respectively.
Document 7: 2011 Copa del Rey Final: The 2011 Copa del Rey Final was the 109th final since its establishment. The match was a traditional 'El Clásico' rivalry between Barcelona and Real Madrid which took place on 20 April 2011 at the Mestalla Stadium, making it the sixth such Copa del Rey final (the last one was played also in Valencia on 5 April 1990), just four days after the two teams played each other in La Liga and seven days before they played each other in the UEFA Champions League first leg semi-final.
Document 8: 2014 Copa del Rey Final: The 2014 Copa del Rey Final was the 112th final of Spain's premier football cup since its establishment. The match was an "El Clásico" between Real Madrid and Barcelona on 16 April 2014 at Mestalla in Valencia, making it the seventh such Copa del Rey final (the last one was also played at the Mestalla on 20 April 2011). Real Madrid won the cup for the 19th time after a 2–1 win.
Document 9: 2013 Copa del Rey Final: The 2013 Copa del Rey Final was the 111th final since its establishment. The match was a Madrid derby between Real Madrid and Atlético Madrid on 17 May 2013 at the Santiago Bernabéu Stadium in Madrid. It was the clubs' first meeting in the final since the 1992 final when Atlético won 2–0 over Real Madrid. Before this match, the two teams have been finalists on four other occasions in 1960, 1961 and 1975 Copa del Rey; all Atlético wins; except 1975 when Real Madrid won. Atlético lifted the trophy for the tenth time in their history.
Document 10: 2008–09 Copa del Rey: The 2008–09 Copa del Rey was the 107th staging of the Copa del Rey. The competition started on August 23, 2008 and concluded on May 13, 2009 with the final, held at the Mestalla Stadium in Valencia, in which Barcelona lifted the trophy for the 25th time in their history with a 4–1 victory over Athletic Bilbao, who qualified for the third qualifying round of the 2009–10 UEFA Europa League. The defending cup holders were Valencia, but they were eliminated in the quarter-finals.
Document 11: 1917 Copa del Rey Final: The 1917 Copa del Rey Final was the 17th final of the Spanish cup competition, the Copa del Rey. The final was played at Camp de la Indústria in Barcelona on May 13, 1917. The match ended without goals after twenty minutes of extra time. The replay match was played two days later, in the same venue with the same referee. The match ended 1–1, and the teams decided to play twenty minutes of extra time. Neither team scored a goal in that time, so they decided to play another twenty minutes of extra time. Three minutes in the second extra time, Ricardo Álvarez scored for Madrid FC. This was the fifth title for Madrid FC.
Document 12: El Clásico: El Clásico (] ; Catalan: "El Clàssic" , ] ; "The Classic" ) is the name given in football to any match between fierce rivals Real Madrid and FC Barcelona. Originally it referred only to those competitions held in the Spanish championship, but nowadays the term has been generalized, and tends to include every single match between the two clubs: UEFA Champions League, Copa del Rey, etc. Other than the UEFA Champions League Final, it is considered one of the biggest club football games in the world, and is among the most viewed annual sporting events. The match is known for its intensity.
Document 13: 2011 Joan Gamper Trophy: The 2011 Joan Gamper Trophy was the 46th edition of the Joan Gamper Trophy. Spanish side and hosts Barcelona faced Italian side Napoli at the Camp Nou in Barcelona.
Document 14: 2012–13 Copa del Rey: The 2012–13 Copa del Rey was the 111th staging of the Copa del Rey. The competition began on August 29, 2012 and ended on May 17, 2013 with the final, held at the Santiago Bernabéu in Madrid, in which Atlético Madrid lifted the trophy for the tenth time in their history with a 1–2 victory over hosts Real Madrid in extra time. Barcelona were the defending champions but were eliminated by Real Madrid in the semifinals. Going into the competition, the winners were assured of a place in the group stage of the 2013–14 UEFA Europa League, but both finalists had already qualified for the 2013–14 UEFA Champions League a few weeks before.
Document 15: Choc des Olympiques: The Choc des Olympiques ("Clash of the Olympics") is the name of the football local derby between two major teams in French football with "Olympique" in its names – Olympique Lyonnais and Olympique de Marseille. The French major football broadcaster Canal+ calls this game "Olympico" referring also to El Clásico. It specifically refers to individual matches between the teams. Unlike Le Classique, the rivalry has no bad blood within it and, instead, stems from the competitiveness of the each club's players, managers, supporters, and presidential hierarchy. The rivalry is often cited as being particularly important as both clubs are of high standard in French football and the championship is regularly decided between the two. Marseille and Lyon (along with Saint-Étienne and Paris Saint-Germain F.C.) are the only French clubs to have won the French first division four straight times with Marseille doing it on two occasions.
ground_truth: Real Madrid and FC Barcelona