MILAN -- AC Milan and their third-choice goalkeeper surprisingly edged city rival Inter Milan 1-0 after extra time to reach the semifinals of the Coppa Italia on Wednesday.
Patrick Cutrone scored in the 104th minute to book Milan a meeting with Lazio in a two-legged semifinal in January and February.
This is one of the few positives in a miserable season for Milan, who are 11th in Serie A. Milan and Inter have lost their last two league matches but the Nerazzurri are third in the league.
Milan were already without teenage goalkeeper Gianluigi Donnarumma and were hit by a late blow when second-choice Marco Storari pulled out of the warm-up with injury.
Antonio Donnarumma was given his debut. A former Milan youth team player, he was re-signed by the Rossoneri as part of the deal that saw his younger brother sign a new, long-term contract.
Donnarumma appeared to have committed a howler midway through the half when Ivan Perisic knocked back a corner and the ball came off the goalkeeper and into his own net, but his blushes were spared when the goal was ruled out after video review confirmed Andrea Ranocchia was offside and standing practically on the line.
That seemed to settle Donnarumma's nerves and the keeper acquitted himself well, with confident saves.
He did brilliantly on the hour mark with a sensational reaction save to deny Joao Mario from point-blank range, although the Portugal international should have done better after being set up perfectly by Mauro Icardi.
Both sides had good chances to seal the match in regulation time but it took until just before the halfway point in extra time for the deadlock to be broken.
Suso chipped a ball over the top, and substitute Cutrone sidefooted it past Samir Handanovic from 10 yards. The teenager was booked for taking his shirt off during wild celebrations.