Leeds took a huge step towards Premier League safety with victory at fellow strugglers Watford, whose own survival hopes were dealt another blow at Vicarage Road.
Raphinha's fierce left-footed strike from the edge of the area gave the visitors the lead after the Hornets had twice gone close through Imran Louza and Cucho Hernandez.
Ismaila Sarr squandered a golden opportunity to fire Watford level in the second half, before Rodrigo capitalised on a dreadful mix-up between Hassane Kamara and Samir to double the visitors' advantage.
Leeds compounded Watford's misery when Jack Harrison beat Ben Foster with a powerful shot into the far corner to complete the scoring.