Nemanja Vidic was given his marching orders in the second period after the Serb was adjudged to have felled Daniel Sturridge in the area- offering Gerrard the chance to score a third spot-kick.
But the England captain struck the woodwork before Luis Suarez capped a dominant Liverpool display as the clock ticked down.
Manchester United v Liverpool player ratings
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Scroll through our gallery to see who stood out as Manchester United suffered another Old Trafford defeat...