Barcelona completed the biggest comeback in Champions League history by beating Paris Saint-Germain 6-1 to reach the quarterfinals on Wednesday, scoring the decisive goal of a 6-5 victory on aggregate in the fifth minute of stoppage time. Barcelona scored three times from the 88th minute, with Sergi Roberto’s dramatic late goal sending the Nou Camp fans wild and making their team the first to overturn a 4-0 first-leg defeat since the Champions League format started in the 1992-93 season.