Leonardo feels that Inter deserved to beat Napoli and qualify for the Semi-Finals of the Coppa Italia.
Inter were dominated for large spells and only ended up winning by virtue of a penalty shoot out.
"I am very happy with this performance," Leonardo said. "It was a very balanced game.
"Napoli tried to win with their champions and on their pitch too, but we knew how to suffer.
"We had two clear chances in the first half. If we had scored, the game would have change.
"Our victory on penalties was very deserved."
Asked about reports linking Inter with Sampdoria striker Giampaolo Pazzini, he said: "There are still a few days until the market closes. We'll see.
"If we can add something then fine, but even this evening we showed a great spirit. On the other hand, Inter hadn't won here since 1997."
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