Barcelona were made to work for their win against third-place Getafe in La Liga on Saturday while PSG were held 4-4 by Amiens in France.
Eighteen-year-old Daniel Maldini, the son of AC Milan great Paolo, made his debut for the Rossoneri right at the end of a 1-1 draw with Hellas Verona.
Inter Milan's Serie A title challenge stalled again after a 1-1 draw at lowly Lecce, leaving Juventus four points clear.
Luis Suarez provided a goal and three assists as Barcelona opened up a three-point gap at the top of La Liga after a 4-1 victory over Alaves at Nou Camp.
Real Sociedad went level on points with La Liga leaders Barcelona after snatching a 2-1 victory against Granada thanks to a late strike from Cristian Portu.
Serie A may have sounded like an old broken record for the last eight years, but the ultimate quest to overthrow Juventus' dominance has begun in earnest this summer.
Napoli delayed Juventus' coronation as Serie A champions for another week at least as a goal in each half from Kalidou Koulibaly helped them to a 3-1 win at Chievo.
Juventus need one more point to clinch the Serie A title next week after
second-placed Napoli were held to a 1-1 draw by Genoa
Napoli fell 18 points adrift of Serie A leaders Juventus with a 2-1 defeat at Empoli that edged the reigning champions closer to an eighth successive title.
Teenager Moise Kean staged a dramatic intervention as Juventus stretched their lead at the top of Serie A to 18 points with a 1-0 win over Empoli.
Krzysztof Piatek's 57th-minute winner saw AC Milan beat Chievo to claim their fifth straight Serie A win.
Top scorer Mauro Icardi watched from the stands as Inter strengthened their grip on third place in Serie A with a 2-1 win over Sampdoria at San Siro.
Cristiano Ronaldo had a hand in all three goals as Juventus cruised to a 3-0 win at Sassuolo to take their lead at the top of Serie A into double figures.
Inter Milan players left the field to deafening jeers from their own fans after they lost 1-0 to relegation-threatened Bologna in Serie A on Sunday.
Two goals in three minutes helped Genoa secure a 3-1 victory over struggling Empoli in Serie A on Monday.
Krzysztof Piatek has joined AC Milan from Genoa on a four-and-a-half year deal, it has been confirmed.
AC Milan and Genoa have agreed a £31m deal for the transfer of Poland striker Krzysztof Piatek, according to Sky in Italy.
Fabio Borini and Suso scored late as AC Milan reclaimed fourth spot in Serie A with a 2-0 win at Genoa.
Gonzalo Higuain's loan to Chelsea has moved a step closer with AC Milan and Genoa meeting on Tuesday to finalise the sale of Krzysztof Piatek, according to Sky in Italy.
Genoa president Enrico Preziosi has played down suggestions Krzysztof Piatek could join Chelsea in January.
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