Sampdoria's veteran forward Fabio Quagliarella scored an early goal and missed a penalty as his side produced a shock 3-1 win away to Atalanta.
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Towering Colombian striker Duvan Zapata scored one goal and set up two more as Atalanta cruised to a 4-0 victory over Midtjylland.
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Manchester United have agreed a deal with Atalanta to sign winger Amad Diallo Traore in January, the Old Trafford club announced on Monday.
Irrepressible Atalanta kept up their record of scoring at least four goals in every game this season as they despatched Cagliari 5-2 on Sunday.
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Atalanta captain Alejandro Gomez scored twice in an impressive 4-1 win for the Bergamo side away to top-four rivals Lazio in Serie A on Wednesday.
Atalanta, Serie A's leading scorers last season with 98 goals, began their new campaign in the same carefree, entertaining style from last season.
PSG may have ended Atalanta's Champions League dream, but the small Serie A side have shown teams exactly how to compete with the biggest and best.