Watford ended a 13-match winless run against Chelsea by coming out on top 4-1 against their 10-man opponents at Vicarage Road in the Premier League.
The Hornets were a goal and a man to the good before Eden Hazard levelled things up late on, but they regained their lead two minutes later through star man Gerard Deulofeu and then added two more goals.
A second heavy defeat in the space of a week for the defending champions, with the other also coming by a three-goal margin at home to Bournemouth, leaves manager Antonio Conte under real pressure as his men are stuck on two wins from 10 in 2018.
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