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The 2019-20 edition of the UEFA Champions League saw Bavarian giants Bayern Munich win all 6 of their group-stage games, marking it only the 6th instance of a team winning all their group-stage games in the Champions League era.
In the process, Bayern also produced the highest goal difference (+19) and scored the most away goals (16) of any Champions League group-stage winner.
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As the knockout round of the Champions League kicks off, all eyes will be on Bayern as they look to continue their win streak in the competition. Riding such a huge wave of confidence, they would be hoping to win their first title since lifting their 5th at the Wembley in 2013.
In a rematch of the 2012 final, the Bavarian giants will now lock horns with that season's winners Chelsea, who had triumphed on a penalty shootout at the home of Bayern Munich.
On that note, let us have a look at how the teams who have had perfect group-stage campaigns in the Champions League have fared in that season's competition.
#1 AC Milan (1992-93): Lost 0-1 to Marseille in the final
In the very first edition of the Champions League in 1992-93, AC Milan conceded just one goal in their two wins each over the trio of IFK Goteborg, Porto and PSV Eindhoven to produce the first perfect group-stage campaign in competition history.
A star-studded Milan team were the overwhelming favourites in the final against the other group winners Marseille. But Fabio Capello's men came unstuck in the game which mattered most.
French defender Basile Boli's solitary first-half strike for Marseille was the difference between the two teams in the Munich final.
#2 Paris St. Germain (1994-95): Lost 0-3 to AC Milan in the semifinals
Paris St. Germain negotiated a group containing former competition winners Bayern Munich, Spartak Moscow and Dynamo Kyiv to become the first team since Milan to go perfect in a Champions League group-stage campaign.
In the quarterfinals, PSG drew 1-1 with Barcelona in the first leg before beating the Catalan side 2-1 in Paris to complete a 3-2 aggregate win.
However, in the semis against defending champions Milan, PSG met their match. A solitary goal home defeat in the first leg was followed by a 0-2 defeat at the San Siro, which put paid to PSG's hopes of lifting the title.
#3 Spartak Moscow (1995-96): Lost 2-4 on aggregate to Nantes in the quarterfinals
In only the fourth edition of the revamped European Cup, called the Champions League since 1992-93, Spartak Moscow produced the third perfect group-stage campaign in the competition.
The Russian team beat each of Legia Warsaw, Rosenborg and Blackburn Rovers twice in the group-stage to romp into the quarterfinals, where they locked horns with French side Nantes.
Spartak's inability to score in a 0-2 first leg defeat away from home came back to haunt them. A 2-2 draw in the return leg at home eliminated the Russian capital team from contention, courtesy a 2-4 aggregate defeat.
#4 Real Madrid (2011-12): Lost on penalties to Bayern Munich in the semifinals
It would be 16 long years since the exploits of AC Milan, Paris St. Germain and Spartak Moscow that a team would produce a perfect group-stage campaign. That honour went to Spanish powerhouse and the competition's then nine-time winners Real Madrid.
The Merengues did not drop a point in a group containing Olympique Lyonnais, AFC Ajax and GNK Dinamo Zagreb en route to the knockout round. Madrid beat Russian side CSKA Moscow 5-2 on aggregate in the Round of 16 and conquered APOEL Nicosia 8-2 on aggregate in the quarterfinals to reach the last 4.
In an enthralling semi-final clash with Bavarian giants Bayern Munich, Madrid lost the first leg 1-2 away from home. They still looked to be on course for the final when a quickfire Cristiano Ronalo double provided them a 3-2 aggregate lead.
However, Arjen Robben scored the all-important away goal for the visitors as the tie ended 3-3 on aggregate.
The ensuing penalty shootout at the Bernabeu saw Manuel Neuer deny Ronaldo and Kaka as Munich registered a 3-1 win to reach the final.
#5 Real Madrid (2014-15): Lost 2-3 on aggregate to Juventus in the semifinals
Fresh off winning their record-extending 10th title in the competition, Madrid continued from where they left off, becoming the first team in Champions League history to produce multiple perfect group-stage campaigns.
Madrid saw off Crvena Zvezda, Tottenham Hotspur and Olympiacos home and away to make yet another knockout round appearance in the competition. Their 2-0 first leg win away at Schalke 04 saw them equal the competition record for most consecutive match wins (10).
Although that winning run came to an end in the return leg which Madrid lost 3-4 at home, the Spanish capital team saw off cross-town rivals Atletico Madrid courtesy a 1-0 home win in the second leg to reach the semifinals.
However, Madrid's hopes of becoming the first team to successfully defend their Champions League title or the first team with a perfect group-stage campaign to win the competition came undone against Italian giants Juventus.
Following a 1-2 first leg defeat away from home, Cristiano Ronaldo's early strike in the second leg put Madrid ahead in the tie on away goals - only for their on-loand striker Alvaro Morata to produce the crucial intervention for the visitors in the second half.
With the game producing no more goals, Juventus hung on for a 3-2 aggregate win to book a final date with Juventus, even as Madrid were left wondering what might have been.
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