Napoli's hopes of winning the Serie A title this season suffered a huge blow as they surrendered a two-goal lead at Empoli in seven stunning second-half minutes to lose 3-2 on Sunday.
With Empoli without a victory in their previous 16 league games before Napoli's visit, Luciano Spalletti's side were expected to get the victory that would have seen them keep pace with league leaders Inter Milan.
They were even more overwhelming favourites after a fine finish from Dries Mertens in the first half, and captain Lorenzo Insigne's arrowing effort eight minutes into the second period put them in firm control.