Maurizio Sarri said he was happy for Napoli after his former side inflicted a second Serie A loss of the season on Juventus, who missed the chance to move six points clear of Inter.
Although Cristiano Ronaldo scored for the eighth game in a row, it was too little and too late for the champions after goals from Piotr Zielinski and Lorenzo Insigne put Napoli 2-0 ahead on Sunday.
There were anti-Sarri chants and banners on his return to San Paolo, but the coach was glad to see Napoli arrest their slump, even against his current club.