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Since the second group stage of the Champions League made way for the knockout round (2-legged Round of 16, 2-legged Quarterfinal, and 2-legged Semifinal) in 2003-04, a total of 64 clubs from 17 different nations have qualified for it.
Spain and Germany have had the highest number of different representatives, with 10 apiece, followed by the duo of England and Italy with 7 apiece. Leipzig of Germany and Atalanta of Italy are the Round of 16 debutants in the ongoing 2019-20 edition of the Champions League.
Atalanta, who are the first team to qualify for the knockout round of the competition despite losing their first 3 games, would look to emulate Leicester City (2016-17) by making a run to the last-eight.
Record 13-time winners Real Madrid are the only club to grace the Round of 16 of the Champions League in all editions since the round's inception in 2003-04.
On that note, let us find out how the most successful club in the Champions League era fares among the competition's Top-5 Round of 16 performers:
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#5 Chelsea (8-5)
2012 winners Chelsea are one of 10 teams to have made over 10 Round of 16 appearances in the Champions League. However, Chelsea's 8 wins in Round of 16 ties are equaled or bettered by only 4 other clubs.
The London club was a regular fixture in this round of the competition from 2003-04 to 2011-12, losing to Barcelona in 2004-05 and eventual winners Internazionale in 2009-10 during that 9-year period. However, Chelsea have only 1 win from their last 4 Round of 16 ties, which includes an ongoing losing streak of 3.
The reigning Europa League winners marked their return to the Champions League following a season's absence with another Round of 16 appearance, where they will lock horns with German champions Bayern Munich. It would be the first meeting in the competition between the two clubs since the Londoners prevailed in a penalty shootout in the 2012-13 Champions League final.
#4 Juventus (8-2)
Serial Italian winners Juventus would be making their 11th Round of 16 Champions League appearance in 2019-20. Only 3 clubs, the trio above Juventus in this list, have more Round of 16 Champions League wins than Juventus' tally of 8.
Along with Barcelona, the Bianconeri have the fewest Round of 16 defeats (2) amongst clubs that have made at least 10 appearances in this stage of the competition. Juventus' only defeats in the Champions League Round of 16 have come against Chelsea in 2008-09 and Bayern Munich in 2015-16.
In their 6th consecutive appearance in this stage of the competition, the Bianconeri would meet Olympique Lyonnais - against whom the reigning Italian champions drew 1-1 at home and lost 0-1 away in the group-stage of the 2016-17 edition of the competition.
Juventus were indebted to a Cristiano Ronaldo hat-trick for turning around a 0-2 first-leg deficit en route to a 3-2 aggregate win over Atletico Madrid in last season's Round of 16.
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#3 Real Madrid (9-7)
Record 13-time Champions League winners Real Madrid are the only club to qualify for every Round of 16 of the competition since the knockout round's inception in 2003-04.
However, the Merengues have a less than stellar record in this round of the competition. A 3-2 aggregate defeat to Ajax in last season's Round of 16 was Madrid's 7th at this stage of the Champions League. Only Arsenal (9) have had more Round of 16 reverses than the Spanish capital club.
The only club in the Champions League era to successfully defend their title (2016-17) take on reigning English champions Manchester City in the 2019-20 Round of 16. In the pair's only previous clash during the knockout stage of the competition, Madrid eliminated City 1-0 on aggregate in the 2015-16 semifinals.
#2 Bayern Munich (11-4)
Five-time Champions League winners Bayern Munich are one of two clubs with the most Round of 16 appearances (16) after Madrid's tally of 17.
In their 15 previous appearances, the reigning 7-time Bundesliga winners have won 11 ties. However, Bayern are coming off a 1-3 aggregate defeat to eventual winners Liverpool in the Round of 16 last season.
The German club's other Round of 16 reverses were against Real Madrid in 2003-04, AC Milan in 2005-06 and Internazionale in 2010-11.
The Bavarian giants' 12-1 aggregate win over Sporting CP in the 2008-09 Round of 16 is the biggest win by any team at this stage of the competition.
In their 16th Champions League Round of 16 appearance, Bayern lock horns with 2012 winners Chelsea. That title match, which ended in a penalty shootout defeat on home turf for Bayern, is also the last time the Bavarian giants met the London club in a knockout round fixture of the competition.
#1 Barcelona (13-2)
Barcelona's 13 Champions League Round of 16 wins are the most by any club in the history of the competition.
Since losing two of their first three Round of 16 ties (2004-05 to Chelsea, 2006-07 to Liverpool), Barcelona have gone a cumulative 12-0 in their subsequent appearances at this stage of the competition.
The reigning Spanish champions became the first team to overhaul a 4-0 deficit in the Champions League when they responded to a 0-4 first leg reverse at Paris St. Germain in the 2016-17 Round of 16 with a stunning 6-1 result in the return leg. It was a game where Barca scored thrice in the last seven minutes of the game, which included 2 goals in injury time.
In their 16th consecutive Champions League Round of 16 appearance in 2019-20, Barcelona take on Italian side SSC Napoli. This would be the first competitive meeting between the two sides.
