Inter Milan closed to within a point of Serie A leaders Napoli on Monday after beating Fiorentina 2-1 and gaining revenge for last week's thumping in Florence.
Marko Arnautovic replaced injured Marcus Thuram and nodded home his first league goal of the season shortly after half-time at the San Siro to pile pressure on Napoli who could only draw with Udinese on Sunday night.
Champions Inter travel to Turin for a grudge match with Juventus next weekend with coach Simone Inzaghi hoping for a quick return for Thuram, while Napoli face a tough task at fourth-placed Lazio as a tight title race hots up.
Atalanta are not out of the equation as they sit a further four points back in third following a 5-0 hammering of Verona on Saturday.
"We need to show what we're made of on the pitch," said Arnautovic to DAZN.
"Today we got three important points and we're close to Napoli but it's not done, we've got a long season ahead us and we can only think about winning games."
Monday's win was Inter's payback for being soundly beaten 3-0 by Fiorentina on Thursday, when the two teams finished a fixture which was stopped in December for Edoardo Bove's heart attack.
Fiorentina are sixth and three points behind Lazio after a match which threatened to boil over following Marin Pongracic's own goal which gave Inter the lead in the 28th minute.
Inzaghi and opposite number Raffaele Palladino were both booked as Fiorentina raged against the decision to give the corner from which Pongracic diverted into his own net.
The corner was given even though Alessandro Bastoni's cleared cross had clearly come from beyond the touchline, with the Viola first left flummoxed at that call and then a goal down.
"I'm really proud of my players, we held our own against a great team, a team which is going to fight for the title all the way," said Palladino.
"My only regret is that decision on the corner because that sort of thing needs to be handled better."
Inter had been dominant however, and by that point had already hit the woodwork through Lautaro Martinez and Carlos Augusto at two previous corners, while Nicolo Barella went close with an outrageous bicycle kick.
And a big decision did go Fiorentina's way in the 43rd minute when Matteo Darmian inadvertantly handled an inswinging cross and conceded, after a long VAR check, the spot-kick from which Rolando Mandragora levelled the scores.
Inter started the second half exactly as they did the first and were deservedly back in front six minutes after the restart thanks to Arnautovic glancing home Carlos Augusto's floated cross. That was enough for Inter who continued to create but failed to make the scoreline match a convincing performance against spirited Fiorentina.
Handball
Simone Inzaghi feels that the handball penalty in today's Serie A clash between Inter Milan and Fiorentina was "non-existent."
The Nerazzurri coach reacted to the incident in a press conference after the match, as reported by FCInterNews.
Fiorentina were awarded a penalty towards the end of the first half of this evening's Serie A match at the San Siro.
The reason for the penalty was a handball by Inter Milan wingback Matteo Darmian.
Fiorentina defender Robin Gosens headed a cross towards the goal. And Darmian was not able to get his arm out of the way, with the ball striking his wrist.
Initially, referee Federico La Penna did not point to the spot.
However, the Fiorentina players appealed for the spot kick.
Meanwhile, that questionable penalty was not the only moment of refereeing controversy.
There was also Inter's opening goal. That was a Marin Pongracic own goal, but it came from a corner that the officials gave despite the fact that replays showed that Alessandro Bastoni had not kept the ball in play.
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