Fabian Ruiz - out of shot - curled in a brilliant individual goal to put Napoli in charge of the tie
Fabian Ruiz's fine goal gave Napoli the edge in the first leg of their Coppa Italia semi-final against Inter Milan.
Ruiz curled a superb away goal from the edge of the area to send Antonio Conte's Serie A leaders to only their second domestic defeat of the season.
Former Chelsea boss Conte was booked during the second half as Inter failed to fashion any clear chances, and they must now win in Naples next month.
AC Milan face Juventus on Thursday at the San Siro in the second semi-final.
Inter came from 2-0 down to beat rivals AC at the weekend and go top of the table but they could not find a late rally on this occasion.
Ashley Young, Alexis Sanchez and Christian Eriksen were all absent from the starting line-up and Dries Mertens and Piotr Zielinski both went close for Napoli in the first half.
Away fans from the Naples region were banned from this match - a consequence of an incident in December 2018, when an Inter fan died of his injuries after being knocked down by a van amid violence before a match between the sides.
Despite that ban, there were still plenty of Milan-based Napoli supporters inside to celebrate the winner from Ruiz.
The midfielder played an elegant one-two on the edge of the box, and then bent a left-footed strike around Daniele Padelli and into the top corner.
Eriksen and Sanchez were introduced as Inter tried to respond, with on-loan Manchester United forward Sanchez failing to get a shot away when well placed and Romelu Lukaku, another former Premier League striker, seeing a scrambled effort well saved.
Eriksen then had a shot deflected wide but Napoli held on to take the lead into the second leg, which takes place on 5 March.
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Line-ups
Match Stats
Line-ups
Inter Milan
27Padelli
37SkriniarBooked at 3minsSubstituted forD'Ambrosioat 45'minutes
6de Vrij
95Bastoni
11MosesSubstituted forSánchezat 74'minutes
23Barella
77Brozovic
12SensiSubstituted forEriksenat 66'minutes
34Biraghi
9Lukaku
10Martínez
Substitutes
1Handanovic
2Godín
7Sánchez
8Vecino
13Ranocchia
15Young
20Valero
24Eriksen
33D'Ambrosio
35Stankovic
46Berni
87Candreva
Napoli
25OspinaBooked at 85mins
22Di Lorenzo
44ManolasBooked at 51mins
19Maksimovic
6Mário RuiBooked at 77mins
8Ruiz
4Demme
20ZielinskiSubstituted forMarques Loureiroat 82'minutes
7CallejónSubstituted forPolitanoat 78'minutes
14MertensSubstituted forMilikat 73'minutes
12Elmas
Substitutes
1Meret
5Marques Loureiro
9Llorente
11Lozano
13Luperto
21Politano
24Insigne
26Koulibaly
27Karnezis
68Lobotka
99Milik
Referee:
Gianpaolo Calvarese
Match Stats
Home TeamInter MilanAway TeamNapoli
Possession
Home55%
Away45%
Shots
Home13
Away5
Shots on Target
Home4
Away2
Corners
Home6
Away5
Fouls
Home12
Away8
Source: bbc.com