Napoli

Juventus 0 Napoli 1

It looked as though Juve were going to preserve their four-point advantage at the summit with four games to play and edge closer to a seventh successive Scudetto only for Koulibaly to throw the race wide open.

Compounding Juve's last-gasp defeat is the fact Massimiliano Allegri's men arguably have the tougher run-in of the two sides, with the Derby d'Italia away to Inter coming up next Saturday, and a clash with Champions League semi-finalists Roma awaiting in the penultimate round of fixtures.

Maradona on Napoli's Insigne

It is a jersey that Napoli retired in 2000 in honour of Maradona, who netted 115 goals for the Serie A side during a spell that encompassed his famous exploits in Argentina's 1986 World Cup triumph.

Insigne is also a revered figure at the Stadio San Paolo and Maradona joked that the Italian would be allowed to wear the shirt number he once donned provided the 26-year-old met one condition.