Arsenal have quit well performance in this season and I don't sure Liverpool have compete for surprising Arsenal, still favorite with The Gunner will win this games and keep large opening with Primer League tittle in this season.
If you look at the performance of the two teams, it's not wrong to make Arsenal the favorite in that match, but have you forgotten that Anfield has been the most haunted place for the red London team so far? Liverpool is in a bad condition, but for the match later, Liverpool have the chance to get back up, especially before they were able to hold Chelsea to a draw and we can see that so far Liverpool are still a pretty great team when they have to face big teams.