Alessandro Del Piero celebrates after securing Juventus three points against Inter.
Juventus beat Inter 2-0 at home in the Derby d'Italia on Sunday to move within four points of the Serie A leaders AC Milan.
Following a first half in which both sides had chances, Juve took the lead just before the hour mark when Martin Caceres was given space to head home from a corner.
Mirko Vucinic might have then made it two but for a tame finish when clean through on goal, but veteran striker Alessandro Del Piero did double the advantage soon afterwards with a tidy finish.
Inter Milan head coach Claudio Ranieri rued his side's lost chances and admitted they fell on the same mistake.
"There are regrets about this game, as for an hour we did very well, but the goal was down to yet another distraction on set plays. From there the game was over for us, as we lost in terms of intensity and determination on every ball," he said.
Juve continued to have the better of the chances, and Maicon needed to make a block on the goal-line from Fabio Quagliarella after a Giorgio Chiellini ball to the far post, but there were no further goals.
The win moved Juve back to within four points of Milan at the top of the table, while Inter are a point behind Catania in eighth.
According to Juventus head coach Antonio Conte, the Serie A title is only for Milan to lose.
"How much do we believe in the title? It is in Milan's hands. I don' t want to upset anyone, but I am objective. The Rossoneri are proving they have such strength in depth that they can continue to do well even through injuries," he said.
Lazio opened up a three-point cushion over Napoli and Udinese as they recorded a late 1-0 triumph over Cagliari.
Lazio hold the last Champions League qualifying spot and are now three points clear of fifth-placed Udinese, who drew 1-1 at Palermo on Saturday, and fourth-placed Napoli, who conceded two goals in the final 15 minutes in a 2-2 draw with Catania at the Stadio San Paolo.
Genoa and Fiorentina played out a 2-2 draw as they both remained in the bottom half of the table.
Relegation-threatened Parma twice struck the woodwork as they had to settle for a 2-2 draw at bottom side Cesena.
Novara came within inches of snatching a last-gasp win over Lecce but had to settle for a goalless draw that leaves both teams in deep relegation trouble.
Atalanta leapfrogged Bologna in the Serie A standings with a 2-0 triumph in Bergamo.