A Cristian Zapata own goal was followed up quickly by Paulo Dybala's strike to give the Sicilian side all three points from the clash
Cristian Zapata had a match to forget as AC Milan suffered a 2-0 home defeat to Palermo in Serie A on Sunday, bringing an end to their six game unbeaten run.
The Colombian came off the bench in the third minute for the injured Alex, but soon found himself in the spotlight for the wrong reasons.
After heading into his own net from a corner, the defender was easily brushed aside by Paulo Dybala as the Palermo striker doubled his side's lead after just 26 minutes.
Milan pushed desperately to reduce the deficit at a sparsely populated San Siro, but found their opportunities limited and quality in the final third lacking.
The defeat is just Milan's second under coach Filippo Inzaghi, but sees their winless run stretch to three matches following draws against Fiorentina and Cagliari.