Marcos Alonso scored the winner for Chelsea in a back-and-forth London derby against Arsenal, who paid the price for their missed chances.
English Premier League: Marcos Alonso (81') Chelsea 3-2 Arsenal
Juventus trailed early in the second half of Cristiano Ronaldo's Serie A debut, but the Bianconeri fought back to earn a late win at Chievo Verona.
English Premier League: Alex Iwobi (41') Chelsea 2-2 Arsenal
English Premier League: Henrikh Mkhitaryan (37') Chelsea 2-1 Arsenal
Italian Serie A: Emanuele Giaccherini (56') Chievo 2-1 Juventus