Milos Krasic grabbed a second-half equaliser as Serie A leaders Juventus had to settle for a point from a 1-1 draw with Catania.
And it could have been much worse for Juve had Andrea Catellani not squandered an injury-time chance to win the match for the Sicilian outfit.
Gonzalo Bergessio fired Catania ahead in the 21st minute after Alejandro Gomez supplied an inviting cross from the right.
Krasic drilled home after 49 minutes but then Juve received a huge let-off in the fifth minute of injury-time when Catellani shot wide when he had just Gianluigi Buffon to beat.
Juve have eight points from four games, as do Udinese, but hold top spot courtesy of scoring more goals.
Udinese extended their unbeaten start but were fortunate to get away with a point in a 0-0 draw at Cagliari.
Udinese striker Antonio Di Natale failed to find the back of the net for the first time this year but he was not given many chances to score as the home side did most of the attacking.
New Roma boss Luis Enrique enjoyed his first Serie A win in charge of the Giallorossi after Pablo Osvaldo's goal sunk Parma.
The visitors clinched the points when Osvaldo headed in Aleandro Rosi's cross five minutes into the second half.
Palermo held Lazio to a goalless draw at the Stadio Olimpico.
The hosts dominated possession but could not find the finishing touch against a Palermo side who defended well.
Novara left Bergamo furious at losing 2-1 to Atalanta.
The battle of the Serie A newcomers was going comfortably in the home side's favour when Matias Schelotto and Luca Cigarini put them two goals clear.
Novara managed to half the deficit with a minute of normal time remaining through Filippo Porcari, but appeared to have run out of time.
They had one more chance, though, which Pablo Granoche took, only for the goal to be disallowed for offside despite replays proving otherwise.
Siena stormed to their first victory of the season - 3-0 against 10-man Lecce in Tuscany.
Fresh from their battling performance that resulted in a 1-1 draw at Roma last Thursday, Siena got an early goal from Mattia Destro with Emanuele Calaio then adding the team's second in the 53rd minute.
Lecce's hopes of a comeback suffered a blow when defender Andrea Esposito was handed his marching orders shortly after the hour mark and Calaio scored his second with 20 minutes remaining.
In the early kick-off, a last-gasp goal from Davide Moscardelli ended Genoa's unbeaten start to the season and took Chievo above them in the table.
The Chievo substitute scored with practically the last kick of the game to take the Flying Donkeys above their opponents amongst the early frontrunners after Rodrigo Palacio had put the visitors in front early in the second half and Sergio Pellissier had levelled 15 minutes from time.
Genoa played the last half an hour with 10 men after Dario Dainelli was sent off for giving away a penalty, which Sebastien Frey saved from Pellissier.
An early goal by Clarence Seedorf saw champions AC Milan claim their first victory in Serie A this season after beating Cesena 1-0.
Seedorf scored from the first attack of the game, firing in a 25-yard shot which went just under the bar to beat Cesena goalkeeper Nicola Ravaglia.
Napoli failed to bounce back with a win after their first defeat of the season as they were held to a goalless draw by Fiorentina at the Stadio San Paolo.
Napoli coach Walter Mazzarri fielded his strongest available side after being criticised for resting too many key players when losing to Chievo in midweek.
But there was no beating the team from Florence.
Indeed, the visitors had the better chances of the game and went closer to collecting the three points than their hosts.
Inter Milan secured their first win of the season by seeing off 10-man Bologna 3-1 in Claudio Ranieri's debut game in charge of the Nerazzurri.
Giampaolo Pazzini put the visitors in front in the 39th minute, before Alessandro Diamanti levelled with a penalty in the 66th minute.
Archimede Morleo was sent off after giving away a penalty in the 81st minute, from which Diego Milito put Inter back in front, and Lucio rounded off the scoring three minutes from time as Inter picked up their first three points of the season at the fourth attempt.