Match ends, Inter Milan 0, Napoli 1.
Napoli increased the pressure on Roma in the race for a Champions League group stage place with a narrow victory at Inter Milan.
Spanish forward Jose Callejon scored the winner for the Naples-based club, who are now one point behind second-placed Roma with four games left.
The top two qualify for the Champions League group stage.
Inter are now without a win in six league games and are in seventh spot in the Serie A table.
Earlier, Roma lost 3-1 to Lazio in the Derby della Capitale to leave leaders Juventus four points away from being crowned champions of Italy for a sixth successive season.
AC Milan's European hopes take a knock
AC Milan's hopes of securing a Europa League third qualifying round spot were dented as they were held to a 1-1 draw away at relegation-threatened Crotone.
Milan, who are sixth, finished the game with 10 men after Slovakia midfielder Juraj Kucka was dismissed in the 90th minute.
Palermo secured only a fourth league win of the season to stave off relegation for at least one more game.
The next-to-bottom side beat eighth-placed Fiorentina 2-0 but are still 10 points from safety with four games to go.
Former Roma striker Mattia Destro scored twice as Bologna hammered Udinese 4-0 while there were also wins for Chievo, Cagliari and Sassuolo.
- 24MurilloBooked at 52minsSubstituted forAndreolliat 77'minutes
- 77BrozovicBooked at 56mins
- 6João MárioSubstituted forPerisicat 60'minutes
- 23ÉderSubstituted forBanegaat 73'minutes
- 94Yao Guy
- 96Barbosa Almeida
- 26KoulibalyBooked at 65mins
- 20ZielinskiSubstituted forRogat 63'minutesBooked at 73mins
- 17HamsikSubstituted forAllanat 73'minutes
- 14MertensSubstituted forMilikat 81'minutes
- Gianluca Rocchi
- Shots on Target
Second Half ends, Inter Milan 0, Napoli 1.
Attempt saved. Yuto Nagatomo (Inter Milan) header from the centre of the box is saved in the bottom right corner. Assisted by Éver Banega with a cross.
Foul by Arkadiusz Milik (Napoli).
Roberto Gagliardini (Inter Milan) wins a free kick in the attacking half.
Foul by Amadou Diawara (Napoli).
Yuto Nagatomo (Inter Milan) wins a free kick in the defensive half.
Foul by Faouzi Ghoulam (Napoli).
Antonio Candreva (Inter Milan) wins a free kick in the defensive half.
Attempt blocked. Arkadiusz Milik (Napoli) left footed shot from outside the box is blocked.
Arkadiusz Milik (Napoli) wins a free kick in the attacking half.
Foul by Marco Andreolli (Inter Milan).
Attempt blocked. Marcelo Brozovic (Inter Milan) right footed shot from outside the box is blocked.
Substitution, Napoli. Arkadiusz Milik replaces Dries Mertens.
Corner, Inter Milan. Conceded by Kalidou Koulibaly.
Substitution, Inter Milan. Marco Andreolli replaces Jeison Murillo.
Attempt missed. Marko Rog (Napoli) right footed shot from a difficult angle on the left misses to the left. Assisted by Dries Mertens.
Offside, Napoli. Kalidou Koulibaly tries a through ball, but José Callejón is caught offside.
Attempt blocked. Lorenzo Insigne (Napoli) right footed shot from outside the box is blocked.
Marko Rog (Napoli) is shown the yellow card for a bad foul.