Fiorentina were the biggest losers of the weekend as they lost their grip on fourth place, while Genoa's wretched run of form saw them fall to a seventh defeat in eight at Pescara
Atalanta kicked off round 16 of the Serie A championship by ending a run of three straight defeats with a 2-1 win over Parma on Saturday.
The Orobici took the lead inside just four minutes through German Denis, who nodded Ezequiel Schelotto's cross past a flailing Antonio Mirante.
They then doubled their advantage on 38 minutes, as Maxi Moralez orchestrated a counterattack, resulting in Federico Peluso sweeping up Denis' parried shot.
And despite Amauri heading home Marco Marchionni's cross to pull one back for the visitors on the stroke of half-time, Atalanta held on to climb to leapfrog Parma into eighth place.
ROMA 4-2 FIORENTINA
Roma came out on top in the clash of the Champions League pretenders on Saturday, as they defeated Fiorentina 4-2 in thrilling fashion at the Stadio Olimpico.
Inside only seven minutes, Francesco Totti's flighted free kick was headed across goal by Panagiotis Tachtsidis and Leandro Castan bundled over the line.
But just moments later, Fiorentina re-enacted a near-mirror image of the Giallorossi's opening goal when Borja Valero's set-piece was tapped in by Facundo Roncaglia.
Fortunately for purists and Roma fans, the high-octane nature of the match was not to fizzle out, as Francesco Totti grabbed the first of his double on 19 minutes by finishing off Mattia Destro's cut-back.
Totti then gave his side breathing space at the end of the first-half with a brilliant strike from 35 yards out after surging forward on the break, leaving Emiliano Viviano helpless.
Returning coach Vincenzo Montella made an inspired substitution during the break when he brought on Mounir El Hamdaoui. The Moroccan repaid that move by tucking home another Valero assist.
The fixture remained on a knife edge for much of the second period, but Pablo Osvaldo's injury-time strike, aided by Totti and Simone Perrotta's vision, saw Roma draw level on points with the Viola in fourth.
PESCARA 2-0 GENOA
Cristiano Bergodi finally got his Pescara career off the mark with a 2-0 victory over fellow strugglers Genoa, who look set to sack coach Luigi Del Neri.
The deadlock was broken on 53 minutes when Elvis Abbruscato popped up in the box to finish off Vladimir Weiss' cross, and the points were bagged 20 minutes later thanks to Ante Vukusic's first goal in Delfini colours.
Pescara now jump to 18th place in the standings, but the Rossoblu drop a spot below their relegation rivals and have now lost seven of their last eight matches.
SIENA 1-3 CATANIA
Catania turned around an early deficit to emerge 3-1 winners over Siena at the Artemio Franchi on Sunday.
The Sicilians started on the back foot, with Alessandro Rosina collecting Francesco Valiani's square pass and coolly poking the ball beyond Mariano Andujar on 10 minutes.
However, just five minutes after the restart, Gonzalo Bergessio's defence-splitting through pass was tucked away with deft accuracy by Lucas Castro for his second Serie A goal.
Seventeen minutes later, Bergessio found the back of the net from Francesco Lodi's delightful ball, lifting the finish over Gianluca Pegolo, and Bergessio then rounded off the success late on with his second.
Catania end a run of two successive league defeats and stay eighth, but Siena fall to the bottom of the pack.
CAGLIARI 0-2 CHIEVO
Chievo made it two wins out of two on Sunday, as Eugenio Corini's charges beat Cagliari 2-0 at the Is Arenas.
The game's opening goal did not come until the 67th minute when Alberto Paloschi continued his rich vein of form - following on from last week's hat-trick against Genoa - with a header past Michel Agazzi.
And the victory was sealed with just three minutes of normal time remaining thanks to Cyril Thereau, allowing the Flying Donkeys to move up to 12th place. The Sardinians, meanwhile, stay 14th.
SAMPDORIA 0-2 UDINESE
Udinese may have suffered European heartbreak midweek, but they managed to secure back-to-back Serie A victories in Monday's 2-0 success at Sampdoria for only the second time this season.
The Fruiliani broke their duck on 17 minutes when Antonio Di Natale's ball found Danilo all on his own in the box, and the Brazilian defender took full advantage of his free header.
Di Natale then got on the scoresheet himself as Emmanuel Agyemang-Badu's pass was deflected by Gianluca Berardi and into the path of the Italy international, who rounded off the points.
Nicola Pozzi also missed a late penalty for the hosts, as Udinese climb to eighth in the standings. The Blucerchiati, however, find themselves several places below in 13th position.
BOLOGNA 0-0 LAZIO
In Monday's other match, Lazio, who left talisman Miroslav Klose on the bench, could only draw blanks with a resilient Bologna at the Dall'Ara.
Vladimir Petkovic's side had the best of the possession in Emilia-Romagna, but Federico Agliardi was not to be beaten between the Rossoblu posts, while Alberto Gilardino was left to rue a succession of chances for the hosts.
The German was eventually brought on, but even he failed to find the winner. The last remaining embers of the match soon fizzled out when Libor Kozak was sent off following a second bookable offence on Saphir Taider late on.
Lazio fail to capitalise on Napoli's defeat to Inter but the close the gap to three points in fourth spot, while Bologna jump to 15th in the table.