Table-toppers prolonged their outstanding winning streak with a commanding three-one performance against ten-man the visiting side.
Frank Lampard's squad began to a flying beginning with Brandon Thomas-Asante and the midfielder scoring the back of the net within the initial minutes.
Tatsuhiro Sakamoto contributed a 3-0 advantage just before the break, while James Abankwah was sent off before the half.
A Watford player netted a second-half for the losing squad, but it was nothing more than a meaningless strike.
Coventry's goalkeeper Carl Rushworth had previously blocked a one-on-one opportunity for Watford, which could have altered the game early on.
The Coventry boss commented: “This was a tough fixture today because the opposition are a strong outfit.”
An Ipswich player came off the substitutes to fire the only strike in a 1-0 success over West Brom.
They commanded the game but only found the goalless draw in the closing stages thanks to Clarke's 5th goal of the season.
West Brom thought they had scored in injury time, but the goal was disallowed for a infringement in the penalty area.
Hayden Matthews turned a late own goal to present the visitors a narrow result.
Portsmouth have currently managed just one fixture since the end of last month.
Mark Robins remarked: “It was among the crucial wins we’ve secured this season.”
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