A thrilling six-goal match between Udinese and Napoli was marred by the collapse of Colombian goalkeeper David Ospina, who collided with Udinese's Ignacio Pussetto early in the game and collapsed later in the first half before being carried off on a stretcher and taken to hospital.
Italian media reports said a CT scan was clear but Ospina will remain under observation for the next 24-48 hours. The club have stated via social media that Ospina due to hypertension or 'shock' after the earlier collision caused internal blood loss.
Carlo Ancelotti's side were pegged back after taking a two-goal lead in the first half, but pulled away after the break to reduce Juventus' lead at the top of Serie A to 15 points.
Amin Younes’ curled finish on his first start of the season gave Napoli an early lead before Jose Callejon doubled their advantage with a bundled finish.
Udinese responded in impressive fashion as Kevin Lasagna’s strike got them back in the game on the half-hour before Seko Fofana drove a finish past Ospina to draw the visitors level.
Arkadiusz Milik headed Napoli back in front from a corner in the second half and Dries Mertens made sure of the points as he darted inside and found the net with 20 minutes remaining.
Earlier, Lazio thrashed Parma 4-1 in Rome and relegation-threatened Empoli recorded a vital 2-1 win over second-bottom rivals Frosinone, while bottom side Chievo produced a shock by holding European hopefuls Atalanta to a 1-1 draw in Bergamo.