Milan had won their first six matches of the season -- two in Serie A and four in the Europa League -- but found themselves four goals behind in less than an hour at a soggy Stadio Olimpico in Rome.
Inter Milan made it nine points from three games with a 2-0 win over promoted SPAL, the first goal scored by Mauro Icardi from a penalty which took the referee five minutes to award after consulting with the video assistant.
Serie A
Ronaldo undergoes medical ahead of £100m move to Juventus
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Fiorentina thumped Verona 5-0 away to claim their first win of the season in style and Cagliari also broke their duck with a 1-0 win at home to Crotone.
Serie A
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