Juventus and AC Milan were held to draws to keep things tight at the Serie A summit as only one of the top seven teams managed to win on Sunday.
Sixth-placed Roma's 4-0 thrashing of fifth-placed Inter Milan was the lone success for the leading teams.
Leaders Juve were held 0-0 at home to lowly Siena while second-placed Milan shared a goalless stalemate with seventh-placed Napoli.
Udinese, in third, and Lazio, fourth, both lost in a terrible day for the country's top brass, although it wasn't a great day for entertainment either with four scoreless stalemates.
At the San Siro, Milan had Zlatan Ibrahimovic sent-off for violent conduct but still came closest to winning, leaving coach Massimiliano Allegri satisfied.
"We had several chances and even with 10 men we didn't risk much, to get a point with 10 men is an important signal," he said.
"Creating a lot we continued to play without fear, being clinical in attack and defending well."
Robinho wasted a glorious chance to give Milan the lead from Ibrahimovic's flick when he was through one-on-one with goalkeeper Morgan De Sanctis but he screwed his effort wide of the upright.
Midway through the second half Ibrahimovic was shown his marching orders for petulantly and needlessly slapping Salvatore Aronica, who responded, almost comically, by slapping Antonio Nocerino, behind whom the big Swede had been standing when he launched the intital assault.
Aronica, however, escaped punishment.
Juve dominated throughout against Siena in Turin but it was the visitors who should have won it when Gianluigi Buffon made amends for spilling Reginaldo's shot by somehow keeping out Alessandro Gazzi's follow-up from five yards out.
It may be a missed opportunity for the leaders but they still have a point advantage on Milan and with a game in hand and coach Antonio Conte refused to blame his players.
"I have nothing to say to the lads, they gave their all. When you don't win you're always judged by the result," he said.
Roma kept themselves in the Champions League hunt by hammering Inter Milan 4-0 at the Stadio Olimpico.
It was a miserable return to the Italian capital for Inter boss Claudio Ranieri, who resigned from Roma a year ago.
His side have now picked up only one point from three games following a run of seven straight wins.
Juan opened the scoring on 13 minutes with a towering header from a Francesco Totti corner.
Fabio Borini doubled the lead four minutes before the break as he ran onto Miralem Pjanic's flick, cut inside Walter Samuel and then shot through Julio Cesar's legs.
And four minutes after the break he beat the offside trap to race onto Juan's through ball, held off Lucio and again shot home between Cesar's legs.
Bojan Krkic wrapped up the scoring, and a shambolic defensive performance from the visitors, a minute from time as the diminutive striker held off the attentions of three defenders on the edge of the box before firing home into the corner.
Udinese held onto third spot despite losing 3-2 at Fiorentina.
Emblematic captain Alessandro Di Natale gave them a 14th-minute lead but Mehdi Benatia, on his return from African Cup of Nations duty with Morocco, gave away two penalties, both converted by Stevan Jovetic.
In between, Mattia Cassani headed home Manuel Pasqual's cross for the hosts before Gabriel Torje scored Udinese's second in the last minute.
Genoa beat Lazio 3-2 in Sunday's early match to boost their own European qualification hopes while denting their visitors' prospects of securing a Champions League finish.
Source: AFP
