Napoli defeated Siena 2-0 on Wednesday to reach the Italian Cup final on a 3-2 aggregate and will face Juventus in the May 20 final where they will look to end their 22-year wait for silverware.
Fired-up by their Champions League exit to Chelsea, Napoli went ahead after just 11 minutes through an own goal from Simone Vergassola.
Uruguayan striker Edinson Cavani added the second in the 31st minute after a swift counter-attack sparked by Ezequiel Lavezzi and Marek Hamsik.
"I am happy to be in the final and to have a place in a European tournament," said Napoli coach Walter Mazzarri.
"But I am worried for the rest of the season. The team is tired, you could see that tonight and we have probably lost Christian Maggio (who picked up an injury) at a crucial time."
On Tuesday, Mirko Vucinic's extra-time strike sent Juventus into their first Italian Cup final since 2004 following a 2-2 draw with AC Milan, giving them a 4-3 aggregate victory.
Milan had forced extra-time by leading 2-1 after 90 minutes but ultimately paid for their semi-final, first leg defeat at home last month.
Veteran Alessandro Del Piero had given Juve a first-half lead but second period goals from Djamel Mesbah, his first for Milan, and Maxi Lopez forced the extra period.
Vucinic's goal ensured Juve still have not been beaten this season in 32 games, although they would have lost had the match ended after 90 minutes.
It meant first blood to Juve against the team against whom they're also fighting for the Serie A title.
"Going through means a lot to us, we're really proud," said goalscorer Del Piero.
"I'm delighted for tonight, as much for my goal as for qualification.
"We're here fighting on both fronts and we'll fight to the end."
Milan coach Massimiliano Allegri said his side had lost it in the first leg.
"I'm happy with the performance, the lads played well," he said.
"It was a good game, I'm disappointed we haven't reached the final after a game like this because the lads did everything.
"I'm disappointed to go out in this way but we were compromised already from the San Siro result."