Olivier Giroud provided the decisive touch as Milan claimed a potentially vital victory in the Serie A title race, beating fellow Scudetto hopefuls Napoli 1-0 at Stadio Diego Armando Maradona.

Milan's record in Naples is dreadful, having gone into Sunday's clash with one win in their most recent 14 visits, but the rare success here put them back to the top of the table.

Both teams had penalty shouts controversially turned down inside the opening 15 minutes, though otherwise there were few major flashpoints in an even first half.

Proceedings opened up following Giroud's 49th-minute poacher's effort, yet Milan held firm to leave with a valuable win that puts them three points clear of Napoli and two ahead of Inter.

A ferocious start saw Amir Rrahmani blaze over from inside the box for the hosts and Milan's Ismael Bennacer have a penalty claim ignored after being nudged over by Kalidou Koulibaly inside the first five minutes.

Napoli then thought they were unfairly denied a spot-kick soon after, with Victor Osimhen seemingly tripped from behind by Fikayo Tomori in the box.

A closely contested first half finished goalless and the breakthrough arrived soon after the restart, Giroud instinctively turning in Davide Calabria's wayward shot.

Napoli substitute Adam Ounas almost levelled with 15 minutes to go when his curling left-footed effort went agonisingly wide.

Osimhen tested Mike Maignan from a tight angle following a surging run, and that proved to be the final chance for the hosts, who were fortunate not to concede again in stoppage time when Alexis Saelemaekers wasted a glorious opportunity.