Italian champions Napoli came unstuck at Bologna on Sunday, losing 2-0 to cede the Serie A summit to AC Milan on goal difference.
AC Milan's collapse against Parma on Saturday, when they were held 2-2 after leading by two goals, but Antonio Conte's Napoli failed to exploit their chance.
After the first half ended goalless, Napoli were caught off guard five minutes after the break, with a precise shot by Thijs Dallinga following a magnificent cross from the left by Nicolo Cambiaghi, who had come on after halftime.
In the 66th minute, Bologna wrapped up the win. This time the danger came from the right: a cross and a header by Jhon Lucumi into Napoli's top right corner.
Bologna moved to fifth, a point off the leading pair.
Inter Milan and Roma, also both only one point behind the top two, can finish Sunday as Serie A leaders after their later games against Lazio and Udinese, respectively.
In other action, Sassuolo downed Atalanta 3-0 and struggling Genoa were held 2-2 by last-placed Fiorentina.
