Second-placed Napoli threw the Serie A title race open in dramatic style on Sunday when Kalidou Koulibaly scored with a towering header in the last minute to give them a 1-0 win at leaders Juventus.
Napoli cut the gap between themselves and the Turin side to one point with four matches to play, setting up a dramatic finale to the Serie A season.
Juventus, chasing a seventh successive title, still face difficult matches away to Inter Milan and AS Roma.
Napoli dominated the match but seemed to have run out of ideas and energy until the final minute when Jose Callejon's outswinging corner was met by the Senegal international with a monstrous header which left Gianluigi Buffon helpless.