Watford 1 Chelsea 2
Tammy Abraham and Christian Pulisic both scored again as Chelsea chalked up a seventh consecutive away win.
Abraham’s wonderful finish – his 10th goal of the season – gave them an early lead at Vicarage Road.
Jorginho carved open Watford’s defence with a sublime pass across to Abraham, who swept the ball past keeper Ben Foster with a fine first-time finish.
And Abraham set up Pulisic 10 minutes into the second half for the in-form American’s fourth goal in two Premier League matches.
Willian picked out Abraham on the right and the striker played the ball across for Pulisic to apply the finish.
Gerard Deulofeu pulled a goal back with a late penalty after VAR ruled that he had been fouled by Jorginho.
Chelsea’s win left them third in the table and would have been by a far greater margin but for several saves by the outstanding Foster – who almost equalised for his team right at the end.
Foster produced three excellent stops to keep the struggling home side in the game after Abraham’s fifth-minute opener.
He denied Abraham at point-blank range and somehow managed to tip away Pulisic’s header from Willian’s right-wing corner.
Watford, bottom of the table and without a win this season, then enjoyed a decent spell of first-half pressure and almost equalised when Deulofeu’s shot flashed narrowly wide.
But Chelsea remained a threat and Foster came to his team’s rescue again shortly before half-time by palming Mason Mount’s long-range strike against the bar.
Pulisic eventually doubled the Blues’ lead but they had to come through some anxious moments after Deulofeu’s spot-kick – not least when keeper Kepa kept out a diving header from his opposite number Foster, who had gone forward for the final few seconds.
Chelsea: Kepa, Azpilicueta, Zouma, Tomori, Emerson, Jorginho, Kovacic, Willian (James 90), Mount, Pulisic (Hudson-Odoi 83), Abraham (Batshuayi 88).
Subs not used: Caballero, Alonso, Giroud, Gilmour.