Lorenzo Insigne moved alongside Diego Maradona on Napoli's all-time list of leading goalscorers after hitting his 115th goal for the Serie A club.
The Italy international converted a penalty early in the second half of Sunday's 4-1 derby win against Salernitana.
That meant he joined Maradona in a tie for third place in the Napoli record books.
Dries Mertens heads that list and slotted a penalty just before half-time to give Napoli a 2-1 lead, his 144th goal for the club.
Belgium international Mertens stepped aside to allow Insigne to take responsibility for the second spot-kick in the 53rd minute.
Insigne had come on as a substitute for the start of the second half, and Mertens said: "I left the second penalty to Lorenzo because it was important to him."
Writing on Instagram after the match, Insigne expressed his delight at the victory.
He will leave at the end of the season to join Toronto FC, but the 30-year-old insisted he would always hold the club dear.
"The derbies are not played… they are won…. We continue like this until the end," Insigne wrote. "Always and forever FORZA NAPOLI."
Insigne is now six goals behind second-placed Marek Hamsik on the Napoli goalscoring list.
115 - Lorenzo Insigne has equalled Diego Armando Maradona (115 goals) as the 3rd player with the most goals scored in the history of Napoli in all competitions. Podium.#SerieA #NapoliSalernitana pic.twitter.com/XFceGoNpCF— OptaPaolo (@OptaPaolo) January 23, 2022
The late Argentina legend Maradona remains the greatest and most revered player in Napoli's history, having joined from Barcelona in 1984 and spent seven years in Naples.
He helped Napoli win league titles in 1986-87 and 1989-90 – the only Serie A championships the club have won – and his death in November sparked an outpouring of grief in the city.
Sunday's goal was Insigne's sixth goal of the season across all competitions, with Napoli's win moving them just four points behind Serie A leaders Inter.
Mertens believes Napoli can still push Inter hard for the title, saying on the club's website: "We must continue like this and look only at us. The championship is still long and we can be protagonists."