Champions League: Manchester United stage dramatic comeback, PSG thrash Villarreal; Barcelona and Bayern emerge victorious

Manchester United staged a stunning comeback to recover from its worst start to a European home game by beating Roma 3-2 in the Champions League on Tuesday.Paris Saint-Germain, meanwhile, set a record as the quickest team to score four goals in the history of the competition by powering into a 4-0 lead after 17 minutes against Villarreal on its way to a 6-0 win.Elsewhere, Barcelona beat Aston Villa 3-0 and Bayern Munich won 2-0 at Atletico Madrid.But the biggest drama of the night came at Old Trafford, where United's troubled season looked set to plunge deeper into crisis after going…