MILAN: Fiorentina defender Facundo Roncaglia, aided by a blunder from Napoli goalkeeper Morgan De Sanctis, scored from just inside his own half in a 1-1 Serie A draw on Sunday.
Uruguay forward Edinson Cavani replied for Napoli with his 100th Serie A goal and 17th of the season to take his side level on points with Lazio in second place.
Napoli and Lazio both have 43 points from 21 games, five behind Juventus who thumped Udinese 4-0 on Saturday.
Giampaolo Pazzini scored twice, the second an exquisite lesson in close control, to give AC Milan a 2-1 win over Bologna while bottom club Siena ended a run of six successive defeats by beating Sampdoria 1-0.
Fourth-placed Inter drew 1-1 at AS Roma as Argentina forward Rodrigo Palacio scored in first-half stoppage time to cancel out a controversial penalty converted by Francesco Totti for the hosts.
Those results meant that Milan climbed above Roma into sixth place with 34 points, two behind Fiorentina and five adrift of Inter.