Gonzalo Higuain scored two goals in six minutes as defending champions Juventus returned to the top of Serie A with victory over Sassuolo.
Argentina striker Higuain’s clinical low shot into the bottom corner set the hosts on their way.
He made it three goals in three league games since joining in July for £75m from Napoli with a volley.
Miralem Pjanic, a £25m signing from Roma, headed home on his debut before Sassuolo’s Luca Antei pulled one back.
Juventus, who start their Champions League campaign at home to Sevilla on Wednesday, have taken nine points from their first three league games, while defeat was Sassuolo’s first of the season.
Massimiliano Allegri’s Juventus are three points clear of Genoa and Sampdoria, both of whom play on Sunday.
Genoa host Fiorentina, while Sampdoria travel to Roma.