I'm 100% believe Liverpool will win, the match will held in Anfield, Atalanta were lose against Cagliari and Fiorentina, it's really shameful for Atalanta can lose against mediocre teams. I predict there will be many goals, probably 4-1 favor in Liverpool.
Two competitive matches are Benfica vs Marseille and Milan vs Roma, the other one Leverkusen vs West Ham, it will be easy match for Leverkusen.
Considering the performance of Atlanta so far as stated in your comment i think the really don't have a chance against Liverpool especially in the fact that they will be playing in Liverpool home anfield, Atlanta this season has been in one of their worse forms because there's actually no other way to explain their poor performance as to been so weak that they will be loosing to weak teams which they shouldn't.
Liverpool isn't any of such team which Atlanta lost to showing weakness in every possible form they could, they should have been able to scare Liverpool a little if they had been able to win their past games such that they will seem to appear sting or even average. Liverpool isn't even joking with the Europa games and so I'm not seeing a way where by Atalanta will get a chance but then football usually has its own surprises it does comes with so i wouldn't want to exercise too much of certainty but i know that most definitely it would be an easy especially on Atlanta.
This may actually be the end of the journey for Atalanta if they eventually loose all their two chances to Liverpool and ofcourse Liverpool isn't going to at any point let Atlanta be the reason they are not able to win the trophy this season to at least be able to Honor their head coach just before he leaves by the end of the season, this Europa trophy is actually very important to Liverpool than almost every other team in the Europa and so they will do their very best to win it at almost all cost.