Watford and Sheffield United will seek to get back on track when they meet on Saturday (15:00 GMT).
The Hornets have lost back-to-back games to fall out of the play-off places while the Blades have picked up just one point from three games since Christmas to fall off the pace in the promotion race.
Watford are unbeaten in each of their past four home league games against Sheffield United (W3 D1), keeping a clean sheet in each of those matches since losing 2-0 in January 2009.
Following a 1-0 win at Bramall Lane in September, Sheffield United are aiming to complete a league double over Watford for the first time since 2008-09 under Kevin Blackwell.