Gary Lineker claimed that Liverpool goalkeeper Alisson Becker was playing better than any Manchester United player in the opening exchanges at Anfield.
The deadlock was broken after just five minutes as Jurgen Klopp's attack waltzed through the Reds' five-man rearguard with Luis Diaz slamming home inside six yards.
United's defence were helpless for the hosts' second after a passage of nimble play and a stunning pass by Sadio Mane that was finished off by Mohamed Salah.
Alisson was busy in the opening stages receiving a number of backpasses but eased by the challenges of the Reds' press inside his 18-yard box.
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