Inter extended their lead over second-placed Juventus to nine points after a 1-0 win at Udinese.
An own goal from Udinese defender Mauricio Isla 13 minutes from time gave the Nerazzurri the 1-0 victory at Stadio Friuli.
Juventus dropped two points in their bid to rein in leaders Inter by only drawing 3-3 at home to Chievo.
Juve had had the opportunity to cut the gap on Jose Mourinho’s side to five points, but The Old Lady succumbed to a 90th-minute goal by Chievo’s hat-trick hero Sergio Pellissier.
Pellissier had twice given the visitors the lead, but the goals were cancelled out, first by Giorgio Chiellini and then an own goal from Mario Yepes, before Vincenzo Iaquinta gave Juve what appeared to be a 79th-minute winner.
Milan scored twice in the final minute of their match at home to Lecce to secure a dramatic 2-0 win, with Ronaldinho and Pippo Inzaghi on target.
Genoa kept up their unlikely charge for Champions League qualification with a 1-0 win at bottom side Reggina. Thiago Motta scored the winner 13 minutes from time.
Reggina were grateful that relegation rivals Bologna and Torino were defeated by Roma and Palermo respectively.
Roma defeated Bologna 2-1, with Francesco Totti scoring twice from the penalty spot and Palermo beat Torino 1-0, courtesy of Edinson Cavani’s 51st-minute goal.
Alberto Gilardino scored an 89th-minute winner as Fiorentina claimed a 2-1 win at Atalanta.
Napoli claimed a 2-2 draw at Sampdoria, with substitute German Denis scoring a 90th-minute equaliser for the visitors.
Former Middlesbrough striker Massimo Maccarone was on target, as Siena defeated Lazio 2-0.
Alessandro Matri scored the only goal of the game, as Cagliari emerged 1-0 winners at home to Catania.