Paris Saint-Germain and Liverpool remain the only teams to have won all three opening Champions League fixtures following Tuesday's games.
PSG needed two late goals from Vitinha and Fabian Ruiz to beat Barcelona 4-2 in a thrilling affair in France.
Goals from Desire Doue and Lucas Hernandez were cancelled out by Xavi Espart and Lamine Yamal.
Luis Enrique's men stay top with a +9 goal difference ahead of Liverpool, who came from behind to see off Villarreal 4-2 at Anfield.
The top five spots are completed by Stuttgart, Aston Villa and Barcelona.
Ahead of Wednesday's fixtures, the bottom four are FC Porto, Lille, Galatasaray and Slovan Bratislava.
Champions League table: PSG, Liverpool only perfect teams after Tuesday's matches