Kevin-Prince Boateng converted a soft penalty with the last kick of the game to give Sassuolo a point after Leonardo Pavoletti’s Cagliari brace.
Fiorentina ran riot over Chievo with a tennis-style 6-1 score, but there could even have been more goals.
Frosinone and Bologna played out a stalemate in a surreal atmosphere, but Canarini goalkeeper Marco Sportiello was decisive.
Serie A debutants Krzystof Piatek and Christian Kouame scored the winning goals for Genoa, but Empoli hit the woodwork twice.
Inter seemed to be in absolute control, but fumbled a 2-0 lead and risked losing the game against a plucky Torino.
Miralem Pjanic’s half-volley and a Mario Mandzukic tap-in on accidental Cristiano Ronaldo assist gave Juventus the victory over Lazio.
Napoli completed an extraordinary comeback from 2-0 down to beat Milan 3-2 in under 30 minutes with Piotr Zielinski’s brace and Dries Mertens.
Roma started with a spectacular Javier Pastore back-heel flick, went 3-1 down to a revamped Atalanta and clawed their way back to a 3-3 thriller.
A simply magnificent volley from Mirco Antenucci proved enough for SPAL to beat Parma and maintain their perfect record.
Rodrigo De Paul’s early strike proved enough to give Udinese the winner against Sampdoria.