Luis Enrique's side were the first in Champions League and European Cup history to rally back from four down after the opening match.
1 – Barcelona are the first side in Champions League and European Cup history to overturn a first-leg 4-goal deficit. Mesmeric.— OptaJoe (@OptaJoe) March 8, 2017
Sergi Roberto was the hero for Barca, scoring in the 94th minute to complete what many viewed as an unrealistic feat before the match began.
Neymar had a double, while Lionel Messi and Luis Suarez also found the net for Barcelona. PSG's Layvin Kurzawa was credited with an own goal.