Normal service resumed, just about after a dramatic finish, for Chelsea and Tammy Abraham.
Their midweek run-ending defeat to Manchester United was just a blip for Chelsea who quickly returned to winning ways after holding off the threat of a late Watford comeback.
And for this three points which lifted Frank Lampard's side up to third, they were largely indebted to striker Abraham and some late heroics from Kepa Arrizabalaga.
Tammy Abraham put in a masterclass performance for Chelsea as Frank Lampard's men eased past Watford at Vicarag
Abraham scored the opener before putting it on a plate in the second half for Christian Pulisic to tap in for Chelsea's second
Gerard Deulofeu went down in the penalty area after contract from Jorginho, but the referee was not convinced
Despite VAR showing the Watford man delayed his fall Anthony Taylor was instructed to award the penalty to Watford
Deulofeu dusted himself off and converted the spot kick to set up a nervy final 10 minutes, but Chelsea survived
WATFORD (5-4-1): Foster 8; Janmaat 7 (Femenia 75), Dawson 6, Cathcart 5 (Mariappa 20, 6), Kabasele 6, Masina 6; Deulofeu 6.5, Chalobah 5.5 (Hughes 67, 6), Doucoure 6, Pereyra 6; Gray 6.
Subs not used: Gomes, Hughes, Success, Holebas, Foulquier.
Goals: Deulofeu (80)
Bookings: Kabasele, Janmaat, Dawson
Manager: Quique Sanchez Flores 6
CHELSEA (4-3-3): Kepa 6; Azpilicueta 6.5, Tomori 6.5, Zouma 6.5, Emerson 6.5; Kovacic 7.5, Jorginho 7.5, Mount 7; Willian 7.5 (James 90), Abraham 7.5 (Batshuayi 87), Pulisic 7.5 (Hudson-Odoi 83).
Subs not used: Caballero, Alonso, Giroud, Gilmour.
Goals: Abraham 5, Pulisic (55)
Bookings: Jorginho, Mount
Manager: Frank Lampard 8
Referee: Anthony Taylor 6
Abraham was back on the scoresheet for the first time in six games, setting Chelsea on their way with his ninth league goal of the season to draw level with Sergio Aguero at the top of the Premier League scorers chart.
He then set up Chelsea's second too for Christian Pulisic, following up his hat-trick at Burnley last week, to cap a welcome return to top form for the England striker.
Chelsea winning away under Lampard this season is no surprise and until Gerard Deulofeu got nerves jangling with controversial VAR-awarded penalty this was one of their more comfortable away days.
Chelsea, the Premier League's most prolific side on the road, held onto clinch a seventh successive away win in all competitions, equalling a club record.
For Watford, it is already approaching the time to start doing the maths and wondering how and where they will get the points they need to stay up.
For the first time in their history they have failed to win any of their opening 11 league games.
If it was not for the brilliant Ben Foster, this could easily have been another hammering to go with their 8-0 thumping at Manchester City in September.
And Quique Sanchez Flores is already having to deal with 'you don't know what you're doing' taunts after his late decision to take of Daryl Janmaat was greeted with dissent from the Vicarage Road faithful. This has not proved to be the fairytale return he had in mind.
Kepa Arrizabalaga makes a last-ditch save to deny Watford keeper Ben Foster from scoring a dramatic equaliser