A moment of magic from Danny Welbeck gave Watford a priceless home win over relegation rivals Norwich City.
Manchester United kept the pressure on, but Chelsea and Leicester City also won on a busy Saturday in the top flight.
Mason Greenwood enjoyed another stunning outing in his breakout season, while Jamie Vardy reached the 100 top-flight goals landmark.
Despite not picking Mesut Ozil since the resumption of the Premier League, Mikel Arteta said a player of his ability is welcome at Arsenal.
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Pierre-Emerick Aubameyang reached 50 Premier League goals for Arsenal, and Mikel Arteta is hopeful he will be around to net 100 more.
It was a historic evening for Pierre-Emerick Aubameyang as Arsenal closed on Manchester United and Wolves by beating Norwich City 4-0.
Pierre-Emerick Aubameyang reached 50 Premier League goals in fewer games than Sergio Aguero or Thierry Henry and joined an elite group.
Pierre-Emerick Aubameyang scored after 33 minutes against Norwich City to take his Premier League tally to 50 goals.
Mesut Ozil should be frustrated by a lack of game time at Arsenal, according to Gunners boss Mikel Arteta.