9 need-to-know pre-Watford stats: 5
In 11 games in all competitions at Anfield, Watford have lost nine, winning one and drawing the other.
Their one victory in front of the Kop came in August 1999 when Tommy Mooney scored the only goal of the game for Graham Taylor's men.
That is the only goal netted by the Hornets in their last six visits.