Paulo Dybala and Dries Mertens both scored hat-tricks as Juventus and Napoli maintained their 100 per cent records in Serie A.
On his 100th appearance for Juve, 23-year-old Argentinian Dybala took his tally to 52 goals, with eight of those having come in this season's four league games, as The Old Lady defeated Sassuolo 3-1.
It was a strong response to Tuesday's 3-0 Champions League loss to Barcelona for Massimiliano Allegri's side, yet they were soon displaced at the top of the table when Mertens registered a treble of his own as Napoli thrashed Benevento 6-0 to ensure that they, like Juve and Inter Milan, all have a maximum 12 points so far.
Dybala had opened the scoring with a brilliant first-time shot curled into the net from 25 yards and another fine effort, this one poked home from just inside the box, made it 2-0 in the second half.
Matteo Politano pulled one back for Sassuolo but this was to be Dybala's day and he completed his treble, his second of the season in Serie A, with a free-kick shortly after the hour mark.
Napoli also bounced back from midweek disappointment in Europe as Benevento, still yet to pick up a point in their maiden Serie A campaign, were put to the sword.
Shakhtar Donetsk beat Napoli 2-1 in their Champions League group stage opener on Wednesday but Maurizio Sarri's team looked in the mood as they went 4-0 up inside 32 minutes through Allan, Lorenzo Insigne, Mertens and Jose Callejon.
Mertens then converted two second-half penalties, the second of which came in the final minute, to ensure Dybala was not the only hat-trick scorer on Sunday.
AC Milan, defeated 4-1 by Lazio last weekend, also recorded a victory with ex-Blackburn striker Nikola Kalinic opening his account in the league for his new club in a 2-1 success over Udinese.
Kalinic scored a nine-minute brace in the first half that came either side of Kevin Lasagna's equaliser for the visitors.
Both Torino and Sampdoria's unbeaten records remain intact following a 2-2 draw in Turin.
The visitors went ahead inside a minute through Duvan Zapata but Torino responded with two goals in as many minutes from Daniele Baselli and Andrea Belotti before Fabio Quagliarella levelled prior to the interval.
Cagliari claimed a 2-0 success at SPAL thanks to goals from Nicolo Barella and Joao Pedro.
Paulo Dybala scored three times as Juventus beat Sassuolo.