Napoli slumped to their second straight Serie A loss as Udinese snatched three points from an uninspiring clash at the Stadio Friuli.
Defender Danilo poked home the only goal in the 70th minute to settle a match starved of quality.
Defeat left the visitors facing up to back-to-back 1-0 league defeats after last weekend's home loss to Chievo.
The first half was desperately lacking in excitement and Napoli had the only meaningful chance of it.
Michu did well to hold the ball up on the edge of the area...