The home side are also playing well with them only losing once in their past five games.
A win for either side would see them jump above Chelsea in the Premier League with the current champions having suffered a shock defeat away to Crystal Palace earlier today.
Arsenal knows it won't be easy game to win with manager Arsene Wenger saying: "They are a strong side. They have strong results, they're a balanced team who are dangerous and play good football. They're tough opponents for everybody.
"Marco Silva has impressed, because I think Watford play good football. He was at Hull, where he had a very good start as well, and overall I think he has done very well."
So if you want to watch all the big match action here's how to stream Watford v Arsenal online.