Juventus came from a goal down in Turin to edge visiting Hellas Verona 2-1 with goals from Carlos Tevez and Fernando Llorente.
Fabrizio Cacciatore gave Verona the lead in the 36th. Tevez equalized with an angled shot in the 40th for his third goal in three league matches and Llorente, who was growing unhappy after playing only one minute previously this season, scored the winner with a glancing header in first-half added time following a cross from Arturo Vidal.
Inter Milan continued their fine start to the Serie A season by running riot in a thumping 7-0 victory at recently-promoted Sassuolo.
The Nerazzurri never looked back after taking a seventh-minute lead through Rodrigo Palacio and were three goals to the good by half-time after Algerian midfielder Saphir Taider's effort and Raffaele Pucino's own goal.
Ricardo Alvarez got on the scoresheet at the beginning of the second half, while substitute Diego Milito added a brace either side of Esteban Cambiasso's fine strike to seal an impressive rout.
Livorno missed the chance to move level with the leaders following a goalless draw at Genoa.
The away side were nonetheless content with an away point, especially after young goalkeeper Francesco Bardi made an athletic save in injury-time to keep out Emanuele Calaio's point-blank header.
Thomas Manfredini also hit the crossbar with a looping header late in the game.
Sampdoria defender Lorenzo De Silvestri scored the last of three injury-time goals to deny Cagliari all three points in a 2-2 draw at the Nereo Rocco stadium.
The hosts, who last week benefited from Mauricio Pinilla's stoppage-time goal in their draw with Fiorentina, looked on course for victory when Albin Ekdal put them ahead midway through the first half.
Even though Manolo Gabbiadini equalised very late on, Daniele Conti gave Cagliari the lead again immediately after before De Silvestri popped up in the third minute of time added on and ensure the match finished as a 2-2 draw.
Chievo recovered from conceding in the first minute to claim their first Serie A win of the season 2-1 at home to Udinese.
Just 50 seconds had passed when Maicousel pounced on some forgettable home defending to run the ball into an empty net.
Chievo recovered from their early calamity to equalise through Sergio Pellissier after 13 minutes before Luca Rigoni claimed the match-winner just before half-time with a deflected strike.