C.N. Posillipo defeated Chiavari Nuoto 14-9 on 14 November 2026 in a Serie A1 match at the Scandone in Naples. The Italian Swimming Federation independently reported the same 14-9 result in Naples.

The quarter scores were 3-1, 5-3, 2-0 and 4-5, according to the club. Mattiello scored three goals for Posillipo, according to the federation.

Posillipo played without Renzuto Iodice, who was unavailable through suspension, according to the club. The win took Posillipo to nine points, while Chiavari remained on five.

Mattia Rocchino said the team had reacted after its previous league defeat and wanted to progress in Euro Cup competition, according to the club. Posillipo's stated next fixtures were a Euro Cup trip to Budva on 19 November and an away league match against Ortigia on 21 November.