AC Milan recorded arguably their biggest win of the season on Sunday night, beating Roma 2-0 at the Olimpico.
Patrick Cutrone got the first just after half time with an instinctive finish having been found by a Suso cross.
After a period of playing on the counter, Davide Calabria added the second goal with a neat dink over Alisson.
The result means Milan move within six points of Roma, and seven points away from the Champions League places.
The first 20 minutes were bereft of any real scoring opportunity; Ünder having the best chance with a low shot that Donnarumma tipped for a corner.
Donnarumma – who was celebrating his 19th birthday – then showed good reflexes to parry a Schick shot over the bar from close range, but the Roma forward was offside anyway.
Hakan Calhanoglu felt he could have done better as he led a break before eventually running the ball out of play, while seven minutes before the break Lorenzo Pellegrini whizzed a shot wide from 20 yards.
Just moments into the second-half, Milan took a somewhat unexpected lead. Cutrone led a counter move, sending the ball out wide to Suso, and the Spaniard returned it with a pinpoint cross which the 19-year-old was on hand to divert goalwards from six yards.
Roma instantly pushed for an equaliser and almost had one in the 51st minute as Diego Perotti came close with a low effort from the edge of the box.
Another break could have produced a second goal for the Rossoneri not long after; Franck Kessie seeing his powerful shot tipped behind. From the resulting corner, Calhanoglu tested Alisson with a stinging half-volley that the Brazilian hung on to well.
Milan should have doubled their lead with just under 20 minutes left as substitute Nikola Kalinic was found on the break, but Alisson produced a decisive save and Kostas Manolas blocked Alessio Romagnoli’s rebound.
However, not long after it was 2-0. A perfectly timed feed from Kalinic found Calabria on the overlap, and the young full-back showed great composure to lift the ball over the ‘keeper and send the travelling support into ecstasy.
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It could have been 3-0 just moments later as Calhanoglu was found by a low Suso ball, however the Turkey international could not send his effort goalwards.
Fabio Borini, on as a substitute, should have added a third in injury time as Calhanoglu found him unmarked at the far post, however the former Sunderland fan scuffed his effort over the bar.