First-place Coventry continued their impressive unbeaten run with a commanding 3-1 result against a player-down their opponents.
Frank Lampard's lineup started to a perfect start with their striker and Jamie Allen finding the back of the net within the initial minutes.
Another Coventry attacker added a three-goal advantage just before the break, while the visitors' player was dismissed before the half.
The midfielder converted a second-half for the away team, but it was nothing more than a late strike.
The home side's keeper Carl Rushworth had previously denied a one-on-one opportunity for the winger, which could have altered the contest early on.
Lampard said: “It was a tough fixture today because Watford are a strong outfit.”
Jack Clarke was introduced from the bench to score the lone goal in a 1-0 win over the Baggies.
They dominated the game but only secured the goalless draw in the closing stages thanks to the winger's fifth goal of the season.
West Brom thought they had scored in stoppage time, but the goal was disallowed for a infringement in the penalty area.
Hayden Matthews scored a late own strike to hand Mark Robins' team a 1-0 victory.
Portsmouth have currently managed just one fixture since the conclusion of August.
Mark Robins remarked: “That was one of the vital victories we’ve secured this season.”
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