Atalanta went top of the Serie A standings after Mario Pasalic and Ademola Lookman scored to secure a 2-1 home win over Sassuolo on Saturday.
Sassuolo defender Georgios Kyriakopoulos gave his side the lead with a powerful left-foot volley in the 41st minute, putting Atalanta behind in a league game for the first time this season.
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Pasalic equalised in first-half stoppage time and Lookman sealed the win a minute into the second half after running past Sassuolo's defence and placing the ball into the top right corner of the goal with a curling shot from close range.
Atalanta have now gone unbeaten in their first 10 Serie A matches of the season for the first time in their history.
Atalanta top the standings with 24 points, but have played one more game than Napoli in second with 23. Napoli host Bologna on Sunday.