Atlético Madrid took the lead at the Camp Nou but two Luis Suárez goals have given Barcelona the edge as they travel to the second leg at the Vicente Calderón.
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Club Atlético de Madrid are looking to repeat their 2014 UEFA Champions League quarter-final win against FC Barcelona when the teams meet for the second leg at the Vicente Calderón.
• Diego Simeone's side must come from behind, however, having gone down 2-1 at the Camp Nou despite taking the lead through Fernando Torres. Torres was sent off before half-time and two Luis Suárez goals gave holders Barcelona their seventh successive win against Atlético.
• Before the first leg, the teams' sole previous European tie came at the same stage of the 2013/14 competition. Then, as now, the first leg was at the Camp Nou where Neymar's 71st-minute strike cancelled out Diego's 56th-minute opener for Atlético.
• The teams on 1 April 2014 were:
Barcelona: Pinto, Alves, Piqué (Bartra 12), Mascherano, Alba, Xavi, Busquets, Fàbregas (Alexis Sánchez 68), Iniesta, Messi, Neymar.
Atlético: Courtois, Juanfran, Godín, Miranda, Filipe Luís, Gabi, Tiago, Arda Turan (Rodríguez 77), Koke, Villa (Sosa 71), Diego Costa (Diego 30).
• A week later, a fifth-minute goal from Koke was enough to give Atlético a 1-0 win and a place in the semi-finals – ending Barça's six-year run of reaching the semi-final or better. Atlético are therefore the only team to prevent Barça from reaching the semi-finals in the past eight seasons, and one of only three clubs to have eliminated them in a UEFA Champions League quarter-final: Paris Saint-Germain (1994/95) and Juventus (2002/03) are the others.
• The teams at the Vicente Calderón on 9 April 2014 were:
Atlético: Courtois, Juanfran, Godín, Miranda, Filipe Luís, Gabi, Tiago, Koke, Adrián López (Diego 62), Raúl García, Villa (Rodríguez 79).
Barcelona: Pinto, Alves, Bartra, Mascherano, Alba, Xavi, Busquets, Iniesta (Pedro 72), Fàbregas (Alexis Sánchez 61), Messi, Neymar.
• Barça won both league meetings between the two teams this season 2-1. Diego Godín and Filipe Luís were both sent off in the game at the Camp Nou on 30 January. Koke opened the scoring for Atlético, but Lionel Messi and Suárez turned the game in Barça's favour.
• Atlético clinched the 2014 Liga title at the Camp Nou on the final day of the season, Godín cancelling out an Alexis Sánchez strike to give the visitors their first championship since 1996.
• This is the third season running that Atlético have reached the UEFA Champions League quarter-finals – and they have faced Spanish opposition on each occasion.
• Having got the better of Barcelona in 2014, Atlético lost out to neighbours Real Madrid CF in the last eight 12 months ago, Madrid's Javier Hernández scoring the only goal of the tie with two minutes left of the second leg at the Santiago Bernábeu.
• Madrid had also got the better of Atlético in the 2014 final, running out 4-1 winners after extra time in Lisbon.
• Atlético have hosted Barcelona 109 times before in all competitions with a record of 50 home wins, 36 Barcelona victories and 23 draws.
• Simeone's side were beaten 2-1 at home by SL Benfica on matchday two, but have nevertheless lost only two of their last 28 home European games, winning 23 of them.
• Atlético beat PSV Eindhoven on penalties in the round of 16, a tie that was the first to finish goalless over two legs in the UEFA Champions League era, and the second year in succession Diego Simeone's side had won their last-16 tie on spot kicks following their 2015 defeat of Bayer 04 Leverkusen.
• The Rojiblancos are in the quarter-finals of the European Cup for the eighth time and are seeking a fifth place in the semi-finals.
• Atlético have won seven and lost seven of their 18 European games against fellow Spanish sides. Since a first-leg loss against Villarreal CF in a 2004 UEFA Intertoto Cup final, Atlético's record in 12 European matches against compatriot teams is W5 D4 L3, the defeats coming against Real Madrid (twice) and now Barcelona.
• The Madrid club have won 11 of the 20 UEFA competition ties in which they lost the away first leg. That includes five aggregate wins from six ties when the first game ended 1-2, two of which were all-Spanish affairs; against Real Sociedad de Fútbol in the 1998/99 UEFA Cup third round (second leg 4-1) and Real Madrid in the 1958/59 European Cup semi-finals (second leg 1-0, replay 1-2).
• Following the win against PSV in the last 16, Atlético's shoot-out record in UEFA competition is now W2 L3:
6-7 v Derby County FC, 1974/75 UEFA Cup second round
1-3 v ACF Fiorentina, 1989/90 UEFA Cup first round
1-3 v Villarreal, 2004 UEFA Intertoto Cup final
3-2 v Leverkusen, 2014/15 UEFA Champions League round of 16
8-7 v PSV Eindhoven, 2015/16 UEFA Champions League round of 16
• In the quarter-finals for a record ninth season in a row, Barcelona have won two and drawn two of their away games in this season's competition. They were 2-0 victors at Arsenal FC in the round of 16 first leg, going on to win 5-1 overall.
• Barcelona's European Cup quarter-final record is W14 L3.
• Barcelona have already got the better of Spanish opposition in European competition this season, defeating Sevilla FC 5-4 to win the UEFA Super Cup in Tbilisi in August.
• The Blaugrana lost to Sevilla in the 2006 UEFA Super Cup final at Monaco's Stade Louis II. Overall, their record against Spanish sides in UEFA competition is P23 W7 D6 L10; away it is W1 D3 L6.
• Barcelona's sole away win against Spanish opposition came at Real Madrid in the 2010/11 semi-final first leg, Lionel Messi scoring twice in the final 14 minutes for a 2-0 victory.
• In two-legged ties against fellow Liga sides, Barcelona's record is W4 L6.
• Barcelona have won 38 of the 40 UEFA competition ties in which they won the first leg at home, most recently against FC Bayern München in last season's semi-final (3-0 home, 2-3 away). Both defeats came against English clubs: in the 1983/84 European Cup Winners' Cup quarter-final against Manchester United FC (2-0 home, 0-3 away) and in the 1982 UEFA Super Cup against Aston Villa FC (1-0 home, 0-3 away).
• Barcelona's shoot-out record in UEFA competition is W5 L1:
5-4 v KKS Lech Poznań, 1988/89 European Cup Winners' Cup second round
0-2 v FC Steaua Bucureşti, 1985/86 European Cup final
5-4 v IFK Göteborg, 1985/86 European Cup semi-final
4-1 v RSC Anderlecht, 1978/79 European Cup Winners' Cup second round
3-1 v Ipswich Town FC, 1977/78 UEFA Cup third round
5-4 v AZ Alkmaar, 1977/78 UEFA Cup second round
Coach and player links
• As a player for Sevilla and Atlético, Diego Simeone faced Luis Enrique, first of Real Madrid then Barcelona, 11 times. Luis Enrique won six games, Simeone two, and there were three draws.
• As a player, Simeone's record in Liga matches against Barcelona with Sevilla and Atlético was P7 W1 D3 L3. His only goal against Barça came in a 5-2 defeat for Sevilla in 1994, although he did help Atlético beat Barcelona in the 1996 Copa del Rey final.
• As a coach, his record against the Blaugrana is P16 W1 D5 L10.
• Messi has scored 25 goals in 29 games against Atlético, including three hat-tricks, making them the team he has scored most goals against. No other player has scored more against Atlético.
• Fernando Torres has scored 11 times against Barcelona in 15 games. Ten of those goals came for Atlético, while he scored for Chelsea FC in a 2-2 draw at the Camp Nou in the 2012 UEFA Champions League semi-final second leg.
• International team-mates:
Spain: Andrés Iniesta, Marc Bartra, Jordi Alba, Gerard Piqué, Sergio Busquets, Sergi Roberto & Koke and Juanfran.
Uruguay: Luis Suárez & Diego Godín
• Koke was part of Spain's winning team at the 2013 UEFA European Under-21 Championship along with Marc Bartra.
• Bartra made his senior Barcelona debut in a 2-1 defeat at Atlético in February 2010.
• Arda Turan joined Barcelona last summer after four years at Atlético, where he won the Spanish Super Cup, the UEFA Super Cup, the UEFA Europa League, the Copa del Rey and the Liga title.
• Also played for both clubs: David Villa, Julio Alberto, Sergi Barjuán, Simão Sabrosa, Bernd Schuster, Eusebio Sacristán, Julio Salinas, Miguel Reina, Thiago Motta.
• Coached both clubs: Luis Aragonés, César Luis Menotti, Radomir Antić.
• Óliver Torres will incur a suspension with his next booking. Fernando Torres serves a one-match ban.
• Fernando Torres, Antoine Griezmann and Koke were on target as Atlético beat Barcelona's city rivals Espanyol 3-1 on Saturday.
• Griezmann has scored in nine of his last 11 appearances for club and country.
• In contrast, Luciano Vietto has not found the net since matchday six.
• Busquets and Javier Mascherano are a booking away from a ban.
• Barcelona's Spanish record 39-match unbeaten run in all competitions (32 wins) ended when they lost 2-1 at home to Real Madrid on 2 April. They were beaten 1-0 at Real Sociedad de Fútbol on Saturday and have failed to win their last three league matches, their longest stretch without a victory under Luis Enrique.
• Messi has gone 362 minutes without scoring in all competitions, his worst run for Barça in five years.
• Messi, Suárez and Neymar have scored 109 club goals between them in all competitions this season.
• Messi's senior career total is 499.
• Jérémy Mathieu sustained a right knee injury in France's 4-2 victory over Russia on 29 March and was ruled out for the rest of the season.
• Rafinha (knee, injured on matchday one) returned to action in the quarter-final first leg, playing the last 27 minutes.