Internazionale moved third in Serie A with a 2-1 home win over 10-man Fiorentina - their first home success of the season in all competitions.
Inter were subjected to a tough test for most of the night before a sparse crowd, but emerged with the three points courtesy of goals from Diego Milito's penalty (17) and a fine Antonio Cassano finish (34).
Romulo netted a header for the visiting side five minutes before the break, but Fiorentina's hopes faded when Gonzalo was red carded for a second yellow card having foolishly taken out Yuto Nagatomo with a late challenge on 61 minutes.
Gonzalo had picked up his first booking after being harshly deemed to have handled the ball by blocking Javier Zanetti's cross that led to the concession of the penalty that led to the home side's opening goal.
Inter were relieved to hear the final whistle sound after playing on the counter attack for most of the second period.
But they are now only four points behind joint leaders Juventus and Napoli after six games of the season before they face Milan in the first derby of the season next Sunday.
Inter grabbed the lead courtesy of Milito's well-struck penalty after Philippe Coutinho saw a shot deflect wide of the target on 10 minutes and Esteban Cambiasso had whistled a volley inches past a post a minute later.
Milito then saw a shot come back off the bar from Cassano's delightful ball as Inter pressed for a second.
The visiting side were seeing plenty of possession as goalkeeper Samir Handanovic got down smartly to repel the free-kick from Adem Ljajic on 19 minutes.
Inter netted their second of the night against the run of play moments after Milito saw an effort blocked by goalkeeper Emiliano Viviano as Cambiasso dummied a through ball for Cassano to drill the ball home with Viviano heading in the opposite direction.
The visitors finally earned a deserved reward for their offensive play when Romulo timed his run brilliantly to head home a wonderful cross from David Pizzaro inside the Inter box.
Fiorentina huffed and puffed, but could not find an equaliser despite a brave effort in the second half and it needed a couple of fine stops from Viviano to keep out efforts from Milito after another couple of lovely passes by Cassano and substitute Ricky Alvarez.
The visitors have now lost their past 12 trips against Inter at the San Siro, but will not be too disheartened by the nature of this defeat.