Table-toppers continued their outstanding victory sequence with a dominant three-one scoreline against reduced their opponents.
Frank Lampard's squad started to a perfect start with Brandon Thomas-Asante and the midfielder scoring the back of the net within the first seven minutes.
Tatsuhiro Sakamoto contributed a three-goal goal just before the interval, while the visitors' player was sent off before the break.
Imran Louza scored a spot-kick for the away team, but it turned out to be nothing more than a consolation effort.
The home side's goalkeeper Carl Rushworth had earlier blocked a clear opportunity for Watford, which could have altered the contest early on.
The Coventry boss stated: “It was a challenging fixture this afternoon because the opposition are a strong side.”
An Ipswich player came off the bench to net the decisive strike in a 1-0 victory over the Baggies.
Ipswich commanded the game but only found the tie near the end thanks to the winger's 5th strike of the season.
West Brom thought they had scored in injury time, but the effort was disallowed for a infringement in the area.
Hayden Matthews scored a second-half own strike to present Mark Robins' team a narrow result.
John Mousinho's men have currently managed just one fixture since the conclusion of August.
Robins commented: “It was one of the vital successes we’ve had this campaign.”
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