Emdad Rahman reports from Old Trafford.
Seldom will a game of such magnitude have delivered such a subdued and meek performance from the home team.
Brendan Rogers bought his Liverpool side to Old Trafford this afternoon on the wave of a scintillating run of form, which has seen the Reds pick up 26 points from a possible 30 since January 2014.
Manchester United were completely outplayed by their oldest and fiercest rivals. In fact it seemed that had Rogers opted to leave Simon Mignolet out of the starting eleven United would still have failed to score within 90 minutes, with the Red Devils registering just a single shot on target.
From my vantage point there was only one shout of "Moyes Out!" and the Old Trafford faithful have refrained from a complete revolt against the man in the dugout, even after a comprehensive home drubbing to a rejuvenated Liverpool side.
United were quite simply outfought, outmanoeuvred at every instance and played off the park, yet the fans remained defiant, their sombre mood spilled out into a continued chorus of support for their team and their manager.
David Moyes' team were teased and tortured to the point of humiliation. A manager at another club would have felt the angry breath of the clubs regulars on his starched collar, but Sir Alex Ferguson's successor is in charge of a national institution with a modern legacy based on giving the manager time.
There's no doubt that Moyes is an accomplished manager but his bumbling United were inept, outplayed by a visiting team always eager to press ahead with clinical attacking intent. The seismic result allows Liverpool to skip over the other Manchester team into second place.
Chief executioner was the magnificent Steven Gerrard, who responded to loud terrace chants by dispatching two clinical penalties. In fact the Liverpool captain missed another opportunity to add another milestone to his amazing history as a Liverpool legend, after a third spot kick hit David De Gea's right-hand post.
United woes increased further as the soon to be departing Nemanja Vidic was red carded following a challenge on Daniel Sturridge, after which Liverpool clinched three points with a third from Luis Suarez.
The numerical supremacy and precision attacking play from Liverpool left Suarez to run through the home defence unopposed to clinch the game.
Despite Rogers stating that Manchester City or Chelsea will win the title his Liverpool team cannot be ruled out, that is for sure.
The Reds have a game in hand over Jose Mourinho's men and Chelsea still have to visit Anfield this season.
United meanwhile were shorn of attacking intent and ideas, with this latest loss sure to have an effect on team morale ahead of Wednesday's Champions League decider against Olympiakos.
Liverpool ran the Champions ragged. "David Moyes is a football genius," was the chant from the away end, and a touch of the old Fergie magic is required if United are to salvage anything of what to their mammoth standards has so far been an abysmal season.
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