Sadio Mane opened the scoring just 15 minutes into the encounter when he slammed into the bottom corner from a neat pass from Adam Lallana.
Jordan Henderson made it 2-0 early in the second half, tucking a low pass from Divock Origi in off of Javier Mascherano. Almost immediately afterwards, Origi added a third, sliding it through the legs of Claudio Bravo.
And Marko Grujic added to the misery for Barcelona, scoring his side’s fourth in the dying minute.
Jesse Lingard scored an absolute thunderb*stard in extra-time as 10-man Manchester United beat Crystal Palace 2-1 to win the FA Cup.
Substitute Lingard struck in the second half of extra-time after Antonio Valencia’s cross had been cleared by a dogged Palace defence.
Alan Pardew’s side had taken the lead through a substitute of their own when Jason Puncheon opened the scoring in the 78th minute, only for Juan Mata to equalise within a matter of moments with a deflected strike.
Chris Smalling was sent off just before the end of the first half of extra-time for a foul on Yannick Bolasie, but United struck the decisive blow to win their first trophy since the 2013 Community Shield in what could be Louis van Gaal’s final game.
