Matias Fernandez's first goal for AC Milan was enough to earn them a 1-0 home win against Genoa.
The Chile international, signed on loan from Fiorentina in the summer, scored the only goal and his first of the season in the 33rd minute after latching on to Gianluca Lapadula's through-ball.
It secured Milan their fourth win in their last five league games and lifted them up one place to sixth in the table, one point behind arch rivals Inter, who drew at Torino.
Fernandez spurned several other chances and Lapadula, Lucas Ocampos, Juraj Kucka and Gerard Deulofeu all went close to increasing Milan's lead, while Genoa goalkeeper Eugenio Lamanna made a string of fine saves.
Genoa remain two places above the relegation zone, albeit 14 points clear of third-bottom Palermo.