Yuto Nagatomo was sent off in the 48th minute, but it didn't stop Inter Milan from claiming a vital 1-0 win over AC Milan at the San Siro on Sunday.
Veteran defender Walter Samuel scored the lone goal of the match, which lifted Inter to a third straight victory.
Inter improves to 15 points on the season, eight points better than struggling Milan, which has lost four league games thus far.
The lone goal came in just the second minute of play. Samuel arrived at the six-yard box to nod home a set-piece delivery from Esteban Cambiasso.
Nagatomo was issued a second yellow card of the match after he was whistled for a blatant hand ball three minutes into the second half, but Milan failed to take advantage of the extra man.
Napoli 2, Udinese 1
Naples, Italy - Napoli scored in the dying minutes of the first half to seal a 2-1 win over Udinese on Sunday, keeping pace with first-place Juventus.
Marek Hamsik gave Napoli the lead at the half-hour mark, but it was canceled out by Udinese's Giampiero Pinzi in the 43rd minute.
Nevertheless, Napoli restored its lead in first-half stoppage time thanks to Goran Pandev, moving the club level with Juventus on 19 points apiece.
Udinese, suffering its third loss of the season, remains stuck on six points.
Juventus 2, Siena 1
Siena, Italy - Juventus maintained its place atop Serie A on Sunday as Claudio Marchisio scored in the 84th minute to give his side a 2-1 win at Siena.
Andrea Pirlo put Juve in front with a well-struck free kick after 14 minutes that found the bottom corner of the net.
Emanuele Calaio provided a reply for the home side on the stroke of halftime when he nodded home Angelo's cross to level the contest.
But Juve pressed forward for a winner and was rewarded six minutes from time when Marchisio charged into the area after a cross and scored on a volley from 14 yards.
Roma 2, Atalanta 0
Rome, Italy - Atalanta dropped its third straight match on Sunday as goals from Erik Lamela and Michael Bradley handed Roma a 2-0 win at the Stadio Olimpico.
After a good start from Atalanta, Roma took the lead against the run of play on the half-hour mark when Lamela exchanged passes with Francesco Totti before firing past goalkeeper Andrea Consigli.
Mattia Destro hit the crossbar for the hosts and then had a shot saved by Consigli, only for Bradley to pounce on the rebound for his first goal of the season, sealing Roma's win.
Catania 2, Parma 0
Catania, Italy - Parma's struggles continued on Sunday as the club dropped a 2-0 contest at Catania, leaving the club with one win in seven league games.
The visitors had drawn their last three matches but fell behind in the first two minutes to a goal from Alejandro Gomez.
Parma then went down to 10 men as Yohan Benalouane received his second yellow card with 20 minutes to play, allowing Catania to clinch the win 10 minutes later.
Gonzalo Bergessio met Mariano Izco's cross to take the ball past goalkeeper Antonio Mirante, giving Catania its third win of the campaign.
Fiorentina 1, Bologna 0
Florence, Italy - Stevan Jovetic continued his hot start to the season as he netted a goal in the seventh minute to give Fiorentina a 1-0 win over Bologna on Sunday.
The goal came from a corner kick as Jovetic pounced on a loose ball to score from close range, giving him five goals on the season.
Fiorentina had chances to add to its lead late in the game, but Nenad Tomovic was denied at close range by goalkeeper Federico Agliardi before Mounir El Hamdaoui narrowly missed the net for the Viola.
Lazio 3, Pescara 0
Pescara, Italy - Lazio rolled to a second successive win on Sunday as the club scored three times in the first half of a 3-0 win at Pescara.
The hosts had won their last two matches, but fell behind after five minutes to a goal from Hernanes.
Miroslav Klose then put the game out of reach with two goals in the span of 10 minutes to give Lazio a commanding lead.
The first goal arrived in the 25th minute as Klose scored on the break following a pass from Antonio Candreva, while the German headed home a corner kick from Hernanes before the break to give Pescara no way back.
Cagliari 1, Torino 0
Turin, Italy - Cagliari became the last team in Serie A to claim a win this season as Nene's 74th-minute penalty kick was all that was required in a 1-0 victory over Torino.
Cagliari had lost its previous three games and would have been propping up the table if not for a six-point deduction against Siena.
But that run of futility came to an end on Sunday as Torino's Kamil Glik was called for handling the ball inside his own penalty area with under 20 minutes to play.
Nene stepped to the spot and drove the ball down the middle past a diving Jean Francois Gillet in the Cagliari net.