Inter Milan suffered their heaviest defeat of the season by losing 4-1 to Atalanta in Bergamo, days after drawing with Barcelona.
AC Milan scored a 97th-minute winner at Udinese through Alessio Romagnoli to regain fourth place in Serie A on Sunday.
Dries Mertens came off the bench to score a last-gasp equaliser as Napoli drew 1-1 at Roma in Serie A on Sunday.
Cristiano Ronaldo's 400th goal in Europe's top five leagues was not enough to extend Juventus' perfect start in Serie A to nine games.
Cristiano Ronaldo scored in his first game since denying rape allegations, as Juventus beat Udinese 2-0 in Serie A on Saturday.
Fiorentina shrugged off their midweek defeat to Inter Milan and reclaim third place in Serie A with a 2-0 win over Atalanta.
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