Manchester United face Liverpool in the FA Cup quarter-finals on Sunday, but how much can you remember about previous ties between the two great rivals?
They have met six times previously in the FA Cup during the Premier League era - test your knowledge with our quiz below.
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Witness History
John Barclay, Sam Warburton and Ugo Monye 
David Busst is carried off on a stretcher at Old Trafford during the match between Manchester United and Coventry City at Old Trafford 
Son Heung-min 
Sir Alex Ferguson celebrates Monmiral's win alongside fellow former football boss Sam Allardyce 
Sir Alex Ferguson celebrates Monmiral's win alongside fellow former football boss Sam Allardyce 
Robbie Keane & John O'Shea celebrate scoring 
Burnley's Sander Berge 
The KC Current flag 
Martin Odegaard 
Martin Johnson 
Felipe Nystrom 
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Graphic showing the F1 drivers for this season