The consequence lifts the Blues back up to fourth within the desk, after they have been briefly leapfrogged by Manchester United.
Nigel Pearson’s aspect stay a degree above the relegation zone however have performed a sport greater than Aston Villa, who journey to Liverpool on Sunday
Olivier Giroud opened the scoring for the Blues, latching on to Ross Barkley’s intelligent move and steering a left-foot shot into the underside proper nook.
While Watford labored laborious to include the hosts they provided little to counsel they have been able to a primary win at Stamford Bridge since 1986.
And they fell additional behind earlier than the break, with Etienne Capoue’s rash problem on Christian Pulisic leading to a Chelsea penalty that Willian duly transformed.
Thereafter it was comparatively plain crusing for Frank Lampard’s aspect, who rounded off the scoring when Barkley discovered the top left nook from Cesar Azpilicueta’s cross.