It took away goals to separate FC Porto and Sevilla FC in their only previous tie, with another tight encounter seemingly in prospect in the UEFA Europa League last eight.
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FC Porto beat Sevilla FC en route to winning the 2010/11 UEFA Europa League, and will hope a rematch augurs well for their prospects in this season's competition as they kick off their quarter-final tie in Portugal.
• André Villas-Boas's Porto beat Gregorio Manzano's Sevilla on away goals in the round of 32 en route to winning the 2010/11 UEFA Europa League. Porto won 2-1 in Spain, but lost the return leg 1-0 in Portugal – with Álvaro Pereira dismissed in the 72nd minute for Porto, and Sevilla's Alexis shown a red card five minutes later.
• The teams for the second leg on 23 February 2011 were:
Porto: Helton*, Álvaro Pereira, Belluschi, Moutinho (Săpunaru 74), Falcao (Guarín 74), Hulk, Fucile, Rolando, Silvestre Varela* (Maicon* 86), Fernando*, Otamendi.
Sevilla: Varas*, Fazio*, Navarro*, Navas, Zokora (Medel 46), Perotti* (Rodri 86), Kanouté, Sergio Sánchez (Luís Fabiano 55), Negredo, Alexis, Rakitić*.
*registered to play for club in this season's competition.
• Five of Porto's last seven European games have ended in scoring draws: two 1-1s, two 2-2s and a 3-3. Their 1-0 round of 16 win against SSC Napoli was their first European home victory this season, following two defeats and two draws.
• Sevilla are the longest survivors in this season's UEFA Europa League, having started out in the third qualifying round. They remain unbeaten away in Europe this season: W5 D2.
• Sevilla became the first team to win a UEFA Europa League penalty shoot-out away from home when they defeated local rivals Real Betis Balompié in the round of 16. The competition's previous two shoot-outs had been won at home by FC Steaua Bucureşti and FC Basel 1893. Sevilla also became only the second club to win a UEFA Europa League knockout tie after losing the first leg at home.
• Porto have reached a quarter-final for the first time since winning the UEFA Europa League in 2010/11. Their 12 UEFA last-eight ties have ended W6 L6.
• This is Sevilla's fourth UEFA quarter-final tie; they won the last two – beating FC Zenit in 2005/06 and Tottenham Hotspur FC in 2006/07 – en route to back-to-back UEFA Cup successes. However they lost the first, against Real Madrid CF in the 1957/58 European Champion Clubs' Cup, after going down 8-0 in the first leg – their heaviest European defeat.
• Sevilla goalkeeper Beto represented Porto from 2009 to 2012 (though he spent the final season of his term on loan in Romania with CFR 1907 Cluj). He largely provided back-up for current Porto No1 Helton, making just 12 league appearances. Beto also played alongside Porto's Ricardo Quaresma (2000-01) and Silvestre Varela (2003-04) in the B team at Sporting Clube de Portugal.
• Sevilla boast more Portuguese talent in the form of defenders Daniel Carriço and Diogo Figueras; Diogo was a team-mate of Porto striker Nabil Ghilas while on loan at Moreirense FC (2012) , and played alongside midfielder Josué at FC Paços de Ferreira (2011-13).
• Sevilla (2006, 2007) and Porto (2003, 2011) are among four previous UEFA Cup/UEFA Europa League winners in the quarter-finals along with Valencia CF (2004) and final hosts Juventus (1977, 1990, 1993). Porto (2011) are the only quarter-finalists to have won the UEFA Europa League in its current guise.
• There are three domestic champions remaining in the competition: Porto, Juventus and FC Basel 1893.
• The UEFA Europa League's two most successful member associations, Spain and Portugal, boast two surviving clubs apiece, with Italy, Netherlands, Switzerland and France taking one club through.
• Sevilla have won the most corners since the start of the group stage of the eight quarter-finalists – 65 in total – and have received the most yellow cards (26).
• Valencia's Paco Alcácer and Sevilla's Kevin Gameiro are the highest scoring players left in the competition, with four goals each since the start of the group stage – four fewer than the overall top scorer, FC Salzburg's Jonatan Soriano.
• Porto dismissed coach Paulo Fonseca on 5 March following a run of four games without a win in all competitions. B-team manager Luís Castro has been placed in command for the remainder of the season.
• Luís Castro was a defender, most notably for UD Leiria and Vitória SC, and had gained a degree in physics by the time he moved from the pitch into the dugout with RD Águeda. He led a number of smaller clubs before taking charge of FC Penafiel, leaving following their relegation from the Liga in 2006. After that, he was in charge of Porto's youth division for a number of years before returning to pitchside with their reserve team in 2013.
• Sevilla coach since January 2013, Unai Emery started out as a midfielder at Real Sociedad de Fútbol, but spent the bulk of his career in Spain's second division, switching from playing to coaching at Lorca Deportiva CF after a serious knee injury. Having led UD Almería to the top tier he coached Valencia CF from 2008 to 2012, with his side regular European contenders during that spell. More recently he had a brief stint at FC Spartak Moskva.