Torino boosted their chances of qualifying for the Champions League by winning 1-0 at Genoa whose fans stayed away in protest at the owner.
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Juventus were forced to put their Serie A title celebrations on hold after second-placed Napoli drew 1-1 at home to 10-man Genoa on Sunday.
Mauro Icardi scored on his first Inter Milan appearance in almost two months to help his side extend their lead in third place with a 4-0 win.
Stefano Sturaro and Goran Pandev scored the goals as Genoa beat Juventus 2-0, with Paulo Dybala's finish for the visitors overturned by VAR.
AC Milan have completed a deal to sign Krzysztof Piatek from Genoa on a four-and-a-half year contract.
Second half goals from Fabio Borini and Suso were enough for Milan to beat Genoa, who were without the suspended Krzysztof Piatek, 2-0.