Inter Milan returned to the top of Serie A with a comfortable 4-0 home win over Frosinone on Sunday evening.
Fiorentina claimed a handsome 4-1 victory over Frosinone at the Stadio Artemio Franchi to move top of Serie A.
Nicola Sansone's free-kick earned Sassuolo an historic 1-0 win over 10-man Juventus on Wednesday at the Mapei stadium.
Juventus captain Gianluigi Buffon has criticised his side's display in their 1-0 loss to Sassuolo on Wednesday night.
Gonzalo Higuain's goal saw Napoli beat Serie A leaders Fiorentina 2-1, while Lazio were beaten 2-1 by Sassuolo.
Red-hot Fiorentina replaced Inter Milan as Serie A leaders by cruising to a 3-0 home victory over Atalanta on Sunday.