Premier League champions Chelsea fell to pieces at Vicarage Road on Monday and suffered a 4-1 defeat at Watford's hands, failing to capitalise upon Liverpool's draw at Tottenham Hotspur as Week 26 came to a climactic close.
Tiemoue Bakayoko was sent off after 30 minutes, and Eden Hazard thought he secured a point for the Blues when he cancelled out Troy Deeney's first-half penalty breakthrough with an 82nd-minute equaliser.
But the Hornets had other plans and scored three in the last 10 minutes as Daryl Janmaat, Roberto Pereyra and January loan signing Gerard Deulofeu all got in on the scoring act to seal a comprehensive victory at home.