Luis Suarez got one back for Liverpool in the 80th minute.
It was from the free kick and Ferdinand couldn't deal with the ball in, Suarez was following up and poked it home from close range.
Earlier, Rooney had made it two for United.
His second was simpler, he received a ball in midfield and had the keeper on, tucking the ball away with his left foot.
Before that, Wayne Rooney got the scoring underway today at Old Trafford as Manchester United took the lead in against Liverpool.
The goal came straight after the halftime break, Giggs swinging in a corner and then Rooney leathering it home with a volley at the back post.
The goal came in the 46th minute.
Watch video to see the goal.
NB This video will be goeblocked in some countries.
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