#2 Taking Manchester United out of the race
What makes this game even more interesting is that Man United play Man City next, and they're likely to succumb to a defeat considering their form, and if Chelsea win, they will be 5 points above Manchester United, potentially ending Ole Gunnar Solskjaer's dreams of playing UCL football next season.
On the other hand, Arsenal have a tough away fixture against the Wolves. Fun fact, Wolves took 4 points out of the available 6 against Chelsea, whereas the most Chelsea could do is take one point and that too through Hazard's solo brilliance. Chelsea have been overpowered by Wolves, and Arsenal are yet to win a game against them too.
If Arsenal and Man United lose their respective games, Chelsea get a chance to solidify their position on 4th as they will be 3 points above Arsenal and 5 above Man United. It's a huge chance for the Blues to capitalize on.