From José Mourinho's touchline celebrations to APOEL heroics and some Ronaldinho magic, UEFA.com picks out a classic round of 16 tie from each of the last 13 seasons.
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The 2016/17 UEFA Champions League is the 14th edition since the knockout round of 16 replaced the second group stage. UEFA.com picks out a classic tie from each of the past 13 seasons – all headline scores are aggregate.
2003/04: Manchester United 2-3 Porto
An occasion etched in the memory, this was just the start for eventual champions Porto. Two Benni McCarthy goals helped earn a 2-1 first-leg win in the first European match at their new Estádio do Dragão, though it was the Old Trafford return that catapulted José Mourinho into global football consciousness. His team were heading out on away goals until Costinha's 90th-minute effort clinched progress and prompted Mourinho's famous charge down the touchline.
2004/05: Chelsea 5-4 Barcelona
For sheer impudence and execution, Ronaldinho's second at Stamford Bridge is one of the most enduringly memorable UEFA Champions League goals. It remains, however, a mere footnote in a thrilling tie. Unperturbed by a 2-1 loss and a red card for Didier Drogba at Camp Nou, Chelsea were 3-0 up after just 19 minutes of the return game. If Ronaldinho's double threatened to derail the west London club, a header from captain John Terry finally secured a notable victory.
2005/06: Juventus 4-4 Werder Bremen (Juve win on away goals)
The opening instalment appeared tame enough: 1-1 with eight minutes left, this tie seemed evenly balanced. However, David Trezeguet then found a (decisive, it transpired) second away goal for Juve, only for Tim Borowski and Johan Micoud to put Bremen on top at 3-2. When the latter struck again early at the Delle Alpi, Bremen looked home and dry. There was time enough, though, for Trezeguet and Emerson to give the Bundesliga side a taste of their own medicine.
2006/07: Bayern München 4-4 Real Madrid (Bayern win on away goals)
Two goals in four minutes – 1,500km and a fortnight apart – turned this contest on its head. Madrid were 3-1 in front at home courtesy of Raúl González and Ruud van Nistelrooy, until Mark van Bommel's 88th-minute effort renewed Bayern's hope for the return match in Munich. There, Roy Makaay levelled the tie with the competition's fastest goal and Lúcio rubber-stamped victory, although Van Nistelrooy's late score made for a nervy finish.
2007/08: Sevilla 5-5 Fenerbahçe (Fenerbahçe win 3-2 on pens)
That Sevilla led this tie twice but still went out speaks volumes. Zico's charges held sway through Mateja Kežman and Diego Lugano in their home leg in Istanbul, only to be pegged back on each occasion. Semih Şentürk did eventually secure Fenerbahçe a narrow first-leg advantage, yet Sevilla came roaring back at home and were 11 minutes from victory – before being taken to extra time. Neither team could find the knockout punch, allowing Volkan Demirel to become the hero with three shoot-out saves.
2008/09: Bayern München 12-1 Sporting CP
The biggest aggregate triumph in UEFA Champions League history, this was scarcely a contest from the moment Franck Ribéry fired Bayern ahead just before half-time in Lisbon. A 5-0 victory ensued and the tie was finished – Bayern, though, were not. Back at home, six different goalscorers helped them equal the single-leg record for the largest winning margin in the knockout stage. Sporting's wounds had been well and truly salted.
2009/10: Manchester United 7-2 AC Milan
United may not quite have matched their own feat of hitting seven past Roma in one game three seasons previously, but this was another all-conquering display from Sir Alex Ferguson's men. Two Wayne Rooney goals contributed to a 3-2 success at San Siro which was the preamble to a vintage Old Trafford performance. Rooney was again at the double as United's pace, power and purpose produced a memorable victory.
2010/11: Bayern München 3-3 Internazionale Milano (Inter win on away goals)
This repeat of the 2010 final promised much and did not fail to deliver. Though Bayern goalkeeper Thomas Kraft's fine showing set the stage for Mario Gomez's 90th-minute winner in Milan, Inter would not relinquish their grip on the trophy without a fight. Samuel Eto'o swiftly drew them level at Fußball Arena München, but Bayern were 3-1 up on aggregate inside 31 minutes. Cue Wesley Sneijder and, two minutes from time, Goran Pandev.
2011/12: APOEL 1-1 Lyon (APOEL win 4-3 on pens)
The first Cypriot side to reach the knockout phase, APOEL's mission appeared even tougher when they lost 1-0 in Lyon. Ivan Jovanović's team had shown themselves to be quite the surprise package, however, and they forced extra time courtesy of an early goal from Gustavo Manduca in Nicosia. Not even the same player's 115th-minute red card could halt APOEL, who had goalkeeper Dionisios Chiotis to thank in the shoot-out.
2012/13: Bayern München 3-3 Arsenal (Bayern win on away goals)
Jupp Heynckes' men were rampant in the north London first leg, moving 2-0 in front inside 21 minutes through Toni Kroos and Thomas Müller. While Lukas Podolski reduced the arrears against his old club, Mario Mandžukić restored Bayern's two-goal cushion to leave the Gunners a mountainous task in Bavaria. Olivier Giroud gave them early hope and Laurent Koscielny made for a frantic final few minutes, but Bayern hung on. They would be back in the English capital come May.
2013/14: Manchester United 3-2 Olympiacos
New manager David Moyes guided United through the group stage unbeaten, but goals in either half from Alejandro Domínguez and Joel Campbell handed Olympiacos a 2-0 first-leg win in Piraeus. The Greek champions had lost on all 11 previous visits to England, however, and had their advantage halved by Robin van Persie's 25th-minute penalty. The Dutchman made it 2-2 on the stroke of half-time, before curling in a free-kick early in the second period to crown another famous United comeback.
2014/15: Paris Saint-Germain 3-3 Chelsea (aet, Paris win on away goals)
Victors against Paris in the 2013/14 quarter-finals, Chelsea seemed well placed to advance again when a 1-1 Parc des Princes draw was followed by a 31st-minute red card for Paris talisman Zlatan Ibrahimović at Stamford Bridge. Gary Cahill's 81st-minute goal then looked to have made sure for José Mourinho's side; however ex-Chelsea defender David Luiz levelled with a towering header five minutes later to force extra time. Eden Hazard's 96th-minute penalty quickly restored Chelsea's advantage, only for another prodigious leap, by captain Thiago Silva six minutes from time, to reward a superlative Paris effort.
2015/16: PSV Eindhoven 0-0 Atlétcio Madrid (aet, Atlético won 8-7 on penalties)
A different kind of classic this, being the first knockout tie in UEFA Champions League history to finish goalless after two legs plus 30 minutes of extra time. Atlético managed 12 shots in the Eindhoven first leg, where PSV lost Gastón Pereiro to a red card early in the second half, but were unable to break through; the Spanish outfit were even more dominant back in Madrid, mustering 24 attempts but again without hitting the net. So to penalties and, after PSV's Luciano Narsingh had hit the crossbar with the 15th kick of the shoot-out, Juanfran stepped up to send Diego Simeone's side through.