Juventus pulled nine points clear at the top of Serie A as a thunderous strike from Carlos Tevez sunk city rivals Torino 1-0.
Tevez's clever shot on the turn after 30 minutes proved enough to restore the Italian champions' advantage over Roma, who edged out Bologna on Saturday night.
Lazio emerged victorious after four goals in 11 frantic second-half minutes lit up the Stadio Olimpico and condemned Sassuolo to a sixth straight Serie A defeat.
Europa League-chasing Lazio appeared happy enough to cling onto a slender lead after Stefan Radu added some excitement to a dull first half with a rare defender's goal.
But, as soon as Sassuolo equalised through Sergio Floccari in the 72nd minute, Lazio went all out for the win, shrugging off Antonio Floro Flores' response to a Miroslav Klose strike to win the game 3-2 thanks to Radu's second.
A second-half fightback from relegation-battling Livorno fell short as European hopefuls Hellas Verona hung on for a 3-2 win in Tuscany.
Three goals in the final 15 minutes of the first half from Bosko Jankovic, Romulo and Luca Toni put the visitors firmly in control but Livorno made a fight of it as Paulo Betanin and Leandro Greco scored two in the space of as many minutes with less than 20 minutes to go.
AC Milan won 2-0 at Sampdoria with a goal in each half from Adel Taarabt and Adil Rami, while city rivals Inter needed a Rolando goal to earn a 1-1 home draw with Cagliari, who had led through Mauricio Pinilla's penalty.
Udinese captain Antonio Di Natale's second-half penalty denied Atalanta their first away win since October 5 - the Bergamaschi looked to be heading for a long overdue success when Davide Brivio gave them a 24th-minute lead at the Stadio Friuli.
Chievo halted a 10-match winless run with a 2-0 triumph over Catania. Cyril Thereau converted from the penalty spot in the 37th minute and Luca Rigoni doubled the lead midway through the second half.