The Champions League is beloved in part for creating matchups that are otherwise unseen, so it's ironic that what's unique about this second leg between Paris Saint-Germain (PSG) and Barcelona in the UEFA Champions League Round of 16 is that overwhelming sense of deja vu.

Every year since they won the tournament in 2014/15, Barcelona have been eliminated in an increasingly humbling manner. First was an away goals loss to La Liga rivals Atletico Madrid, then a 3-0 180 minute shut out from Juventus. The cracks that were starting to show were ripped open the next two years by Roma and Liverpool.

Each of these losses prompted discussions on what Barcelona could do to regain their former glory. The 8-2 loss to Bayern Munich in the single elimination quarterfinals of the COVID-19hit 2019/20 season made it clear those aforementioned discussions were not being heard by Catalonian ears.

Barcelona came into this year's Champions League looking practically identical to the one embarrassed the year before: Luis Suarez was gone, Gerard Pique, Sergio Busquets, Jordi Alba and Leo Messi (with a combined age of 130 years) was still integral to the side. Antoine Griezmann still looked like a misfit out on the left. Clement Lenglet was still making too many mistakes.

It was inevitable that someone would wallop them in the group stage. PSG obliged. Mauricio Pochettino's youthful team ran laps around the Camp Nou, made Barcelona look geriatric and won with an easy 4-1.

Among those goals was a hat-trick from Kylian Mbappe who became unplayable in the second half when he realized no defenders could keep up with him.

No changes in personnel are being made by either Pochettino or Ronald Koeman so it's difficult to anticipate anything besides a continuation of the drubbing. However, PSG are notorious for being mentally weak. From 2013/14 to 2018/19, they lost every single second leg they played by a total of 16-3.

This is particularly relevant because of what happened in 2016/17: PSG beat Barcelona 4-0 at the Parc des Prince in Paris and assumed they could cruise in the second leg. They were instead routed by Barcelona 6-1. No team has ever had such a big advantage and lost it by an even bigger margin.

Five years later, both teams are in different places but the one thing that's united them across every encounter is that it always results in fireworks. Perhaps this time it will be Mbappe lighting the fuse.