The top five in Italy all dropped points on Sunday, meaning Juventus continue to hold a slender lead at the summit.
Juventus remain one point clear at the top of the table, but they could only muster a 0-0 draw with relegation-threatened Siena in their latest outing.
Reigning champions AC Milan missed the opportunity to clamber above Juve after they too were involved in a goalless stalemate on home soil, with Napoli leaving Giuseppe Meazza with a share of the spoils.
A frustrating afternoon for Milan in front of their own supporters was compounded midway through the second half when talismanic striker Zlatan Ibrahimovic was shown a straight red card.
Udinese continue to occupy third spot in the division, but a 3-2 defeat to Fiorentina has left them four points adrift of the leaders.
Things started so well for the Zebrette on Sunday, with Antonio Di Natale opening the scoring inside 14 minutes.
They were, however, to see the Viola turn the tie on its head, with Steven Jovetic restoring parity from the penalty spot six minutes before half time.
Mattia Cassani fired Fiorentina in front on 56 minutes and Jovetic netted his second of the game six minutes from time.
Gabriel Torje offered Udinese hope in the final minute, but there was to be no late drama at Artemio Franchi.
Fourth-placed Lazio also found themselves on the wrong end of a 3-2 scoreline away at Genoa.
An early effort from Rodrigo Palacio (10) and a brace from Boiko Jankovic (25 & 46) saw the hosts establish a commanding lead.
Cristian Ledesma pulled one back from the spot for Lazio on 54 minutes, but they were reduced to 10 men eight minutes from the end when Modibo Diakite saw red.
Alvaro Gonzalez saw the visitors move to within one goal of their opponents in the dying seconds, but his effort was not enough to inspire a dramatic stoppage-time fightback.
Roma are now just five points adrift of the UEFA Champions League places following a crushing 4-0 victory over Inter Milan.
Juan put them on their way to a morale-boosting success after 12 minutes and Fabio Borini (41 & 48) netted either side of the interval to put the capital giants in complete control.
Bojan Krkic put the seal on a commanding win in the closing stages, ensuring that Inter remain fifth in the Serie A standings.
An own goal from Luciano allowed Parma to pick up a 2-1 victory on the road at Chievo.
Sebastian Giovinco handed the visitors the lead on 46 minutes before Cyril Thereau (50) handed the hosts hope of taking something from the game.
It was not to be for Chievo, though, as Luciano put through his own net on 69 minutes.
Palermo edged out Atalanta 2-1 to cement their top-half standing.
Andrea Consigli saw red for Atalanta on 27 minutes and Fabrizio Miccoli converted the resulting spot kick.
Igor Budan doubled Palermo's lead on 49 minutes, ensuring that a 56th-minute reply from Maximiliano Moralez counted for little.
Lecce had Moris Carrozzieri sent off as they were held 0-0 by Bologna and rock-bottom Novara failed to trouble the scorers in a goalless stalemate with Cagliari.