Charles de Ketelaere scored twice and provided three assists as Atalanta ran out 6-1 winners away at Swiss side Young Boys in the Champions League.
Last season’s Europa League winners continue to thrive in Europe's top tier this season, with the victory in Bern leaving them in fourth place in the table, unbeaten after five games.
Mateo Retegui opened the scoring inside 10 minutes, latching on to a through ball from De Ketelaere before finishing low across the goalkeeper.
Young Boys provided an immediate response as forward Silvere Ganvoula nodded home a corner at the near post. However the Swiss side’s joy was short-lived.
De Ketelaere turned from provider into goalscorer to re-establish the Italian side’s lead before he then turned provider twice more to cap off a stunning first-half performance.
The Belgian produced another trademark through ball for full-back Sead Kolasinac to run on to and score, before he crossed for Retegui to grab his second goal of the game.
After the interval De Ketelaere secured his second with a low, deflected finish from the edge of the box.
Substitute Lazar Samardzic tricked his way into the box to add the sixth goal in stoppage time.
A fifth defeat from five games for hosts Young Boys leaves them pointless and rock bottom of the standings in their worst ever performance in a Champions League campaign.
Watch highlights of every Champions League game from 22:00 on Wednesday on BBC iPlayer and the BBC Sport website and app.
There will also be a Champions League Match of the Day on BBC One on Wednesday, from 22:40 to 00:00.