Milan saw their lead on Inter cut to two points but hold pole position at the half-way stage of the season for the first time since they last won the title in 2011
AC Milan held top spot in Serie A Saturday despite falling 3-0 at home against Atalanta after nearest rivals Inter Milan were held to a goalless draw at Udinese.
Stefano Pioli's Milan saw their lead on second-placed Inter cut to two points but hold pole position at the half-way stage of the season for the first time since they last won the title in 2011.
Milan were outplayed at home with Atalanta's Cristian Romero heading in the first goal after 26 minutes in the San Siro.
Josip Ilicic added a second from the penalty spot eight minutes after the break after receiving a Franck Kessie elbow in the face.
Zlatan Ibrahimovic missed a chance to equalize just before half time with the veteran Swede sending side.
Milan's new signing Mario Mandzukic came off the bench for the final 20 minutes but could not find the net on his debut despite testing Atalanta keeper Pierluigi Gollini.
Colombian striker Duvan Zapata connected with a Romero cross to seal the three points with quarter of an hour to go in the San Siro.
For the first time this season Milan failed to score a goal, falling to their second defeat this campaign after losing to Juventus earlier this month.
Goals from Cristiano Ronaldo and Alvaro Morata helped Juventus to beat Napoli 2-0 to win the Italian Super Cup Wednesday, the annual meeting between the Coppa Italia winners and Serie A champions.Posted by Sports Tribune on Wednesday, 20 January 2021
Atalanta move fourth into the Champions League places, seven points behind the leaders, and two points adrift of Roma who went third after a 4-3 win over Spezia.
Coach Gian Piero Gasperini hailed "one of our best performances in recent years".
Antonio Conte's Inter failed to follow on from their win over Juve last weekend, and the chance to go top with a victory in Udine.
Chances were few for Inter with Lautaro Martinez having a goal ruled offside and Nicolo Barella volleying wide in the rain.
Frustrations boiled over with Conte banished from the sidelines at the end of the game for arguing with the referee.
In Rome, Lorenzo Pellegrini scored a last-gasp winner as Roma bounced back after their Italian Cup defeat by Spezia with a 4-3 win over the promoted side.
Pellegrini blasted home in injury time, minutes after Daniele Verde had pulled Spezia level, with relieved Roma coach Paulo Fonseca racing to hug the midfielder.
The capital side have been in turmoil since their chaotic 4-2 extra-time loss to Spezia Tuesday.
German international of Turkish descent Mesut Ozil joining Fenerbahce from Arsenal headlined what was a busy week of transfers in the European leagues.Posted by Sports Tribune on Wednesday, 20 January 2021
The official scoreline was changed to 3-0 Friday, as Roma made six substitutions, with just five allowed, during the last-16 clash which they finished with nine men.
Captain Edin Dzeko was left out of the team Saturday, officially because of a muscular injury, but amid reports of a fall-out with Fonseca.
Borja Mayoral scored a double for the hosts, netting the first after quarter of an hour, only for Roberto Piccoli to pull 14th-placed Spezia level seven minutes later by pouncing on a mistake by home goalkeeper Pau Lopez.
Real Madrid loanee Mayoral slotted home his second on 52 minutes, before Rick Karsdorp tapped in to make it 3-1 three minutes later.
Diego Farias again responded for the visitors just before the hour, scoring the third goal of a dramatic six-minute spell at the Stadio Olimpico.
An error from Chris Smalling allowed former Roma winger Verde to equalize in the 90th minute, firing home left-footed after the England defender missed his attempted clearance.
Pellegrini had the final say, though, drilling the ball into the roof of the net from close range after Bruno Peres' unselfish cutback.
It was a first league win in three games for Roma, after last week's defeat by Lazio in the Rome derby and a draw with title rivals Inter.
Fiorentina, in 12th, eased their relegation worries with a 2-1 win over rock bottom Crotone, thanks to first half goals from Giacomo Bonaventura and Dusan Vlahovica.
Benevento 2 (Viola 31, Lapadula 49) Torino 2 (Zaza 51, 90+3)
Roma 4 (Mayoral 17, 52, Karsdorp 55, Pellegrini 90+2) Spezia 3 (Piccoli 24, Farias 59, Verde 90)
Milan 0 Atalanta 3 (Romero 26, Ilicic 53-P, Zapata 77)
Udinese 0 Inter 0
Fiorentina 2 (Bonaventura 20, Vlahovic 32) Crotone 1 (Simy 66)