Milan had the chance to go top of the table, but crashed to a 3-0 defeat at Genoa with Gabriel Paletta sent off for a reckless tackle.
The Rossoneri were sitting pretty in joint second place and could go top at least for 24 hours with a victory at Marassi. Instead, the Grifone were fresh from the Derby della Lanterna defeat and had drawn their last three home fixtures.
Luca Antonelli, Davide Calabria, Riccardo Montolivo, Andrea Bertolacci and Mati Fernandez missed the trip, so Andrea Poli was turned into a makeshift right-back and Keisuke Honda given his first start of the season. Leonardo Pavoletti and Lucas Ocampos were only fit for the bench, so Nikola Ninkovic came into the trident.
Genoa had won the last two editions of this fixture by 1-0 scorelines, succeeding in three of their last four meetings home and away.
It was the hosts who took the lead after 11 minutes when Tomas Rincon chipped up a cross for Nikola Ninkovic’s diving header from 10 yards, a goal on his first Serie A start for the club. Honda was hanging back and kept everyone onside when the Rossoneri defence had pushed up, while Poli lost his marker.
Rincon was pulling the midfield strings against inexperienced 18-year-old Manuel Locatelli. Former Sampdoria defender Alessio Romagnoli surged forward and unleashed a screamer that whistled just wide of the near post, while Jack Bonaventura’s solo effort was weak and central.
Milan moved to 4-4-2 and Carlos Bacca knocked down a cross for M’Baye Niang to volley over the bar. After the restart, the Rossoneri seemed livelier and there were three incidents in quick succession.
First Locatelli appeared to be barged over by Miguel Veloso just inside the penalty area, but the referee waved play on. Bonaventura’s fierce strike from distance was fingertipped round the post and on the resulting corner a misplaced Bonaventura shot turned into an assist for Bacca, but Perin rushed out to the rescue at his feet.
That optimism evaporated rapidly when Rigoni went on the counter down the Genoa left and was hacked down by a reckless Gabriel Paletta sliding tackle. It was perhaps more obvious than dangerous, but the referee opted for a straight red card – making him the only player to get two Serie A dismissals this season.
Niang risked giving away a penalty or at least an indirect free kick for his astoundingly high foot that struck Nicolas Burdisso on the head, but the referee waved play on.
Rincon curled just wide on the counter, while Niang’s great cross was inches over Bonaventura’s head at the back post.
Perin smothered scorchers from Juraj Kucka and Suso, but Poli capped off a dismal performance by stumbling in the box and slicing wide when running on to an inspired Bonaventura slide-rule pass.
However, Genoa doubled their lead when Leonardo Pavoletti spread the play for Riccardo Fiamozzi down the left and tried to slide on to the low cross, but Kucka got there first for an own goal.
Milan fell apart and Pavoletti did get his goal soon after, as he turned Romagnoli inside out to fire in one-on-one with a helpless Gianluigi Donnarumma.
Genoa had the ball in the net again, but Rigoni was flagged marginally offside on his header.
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Sent off: Paletta 56 (M)