Ashley Young scored his first Inter Milan goal in a 2-1 defeat to Lazio while Real Madrid were held to a 2-2 draw by Celta Vigo.
Barcelona twice came back from goals down to win 3-2 at Real Betis and cut Real Madrid's lead at the top of La Liga to three points.
Cristiano Ronaldo scored a second-half hat-trick to lead Serie A champions Juventus to a 4-0 win at home to Cagliari on Monday.
Lazio beat Juventus 3-1 on Sunday to win the Italian Super Cup for a fifth time amid a background of protests and political outrage.
Cristiano Ronaldo scored his first Juventus goal since October to rescue a 2-2 Serie A draw against Sassuolo.
Paulo Dybala replaced Cristiano Ronaldo and scored the winner as Juventus beat AC Milan 1-0 on Sunday to move back to the top of Serie A.
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