Internazionale suffered their first league defeat of the season when they least expected it on Saturday, going down 3-1 at home to mid-table Udinese, and were knocked off the top of Serie A by Napoli after they won by the same score at Torino.

At the San Siro, a second-half penalty awarded with the help of the video assistant (VAR) and converted by Rodrigo De Paul proved to be the turning point as Luciano Spalletti’s Inter side were finally beaten in their 17th game of the season. The other Udinese goals were scored by Kevin Lasagna and Antonin Barak.

“There’s sorrow like with all defeats,” said the Inter coach Spalletti. “We’re not used to it any more so there’s even more sorrow. But in the end we brought it on ourselves because we weren’t able to control the ball, we made errors and we were timid in our decision-making.”

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Inter’s defeat opened the door for Napoli to move back to the top of Serie A with 42 points from 17 games, two clear of Inter. The Napoli captain Marek Hamsik equalled Diego Maradona’s club record of 115 goals as his side raced to a 3-0 lead after half an hour at the Stadio Olimpico, suggesting that their recent scoring troubles are behind them.

After failing to score in their last two league games, Napoli quickly rediscovered their touch when Kalidou Koulibaly headed them in front after four minutes. Jorginho sent Piotr Zielsinki clear of Torino’s defence for the second after 25 minutes and Hamsik fired home from Dries Mertens’ pass to finish off a flowing move on the half hour. Andrea Belotti pulled one back for Torino just after the hour.

Federico Fazio grabbed the only goal of the game in the fourth minute of stoppage time as Roma beat Cagliari. They stay in fourth position in the league, level on points with third-placed Juventus, who play Bologna on Sunday.

Fernando Torres scored the only goal in a 1-0 victory over Alavés as Atlético Madrid took advantage of a slip-up from Valencia. Atlético dominated possession but struggled for clear-cut chances against their lowly opponents, who held out until the 74th minute. Then Torres tucked away Sime Vrsaljko’s cross to lift Atlético into second place in La Liga, three points behind Barcelona, who play Deportivo La Coruña on Sunday.

Atlético are now two points above Valencia, whose title hopes suffered a major blow as they lost 2-1 to the Basque side Eibar. The Basque derby, meanwhile, failed to catch fire, with Athletic Bilbao and Real Sociedad playing out a goalless draw at San Mames.

Neymar scored two goals and set up two more as Paris St Germain extended their Ligue 1 lead to nine points with a 4-1 away demolition of Rennes.

The Brazilian forward struck both sides of the interval and assisted Kylian Mbappé and Edinson Cavani to score, putting PSG on 47 points from 18 games after second-placed Monaco hammered St Etienne 4-0 on Friday.

In the Bundesliga, Sven Ulreich saved Chadrac Akolo’s 95th-minute penalty as Bayern Munich ground out a hard-fought 1-0 win at Stuttgart. The second-half substitute Thomas Müller got Bayern’s winner against stubborn opponents, firing a snap-shot inside the near post in the 79th minute.

The victory takes Bayern 11 points clear at the top of the Bundesliga, with second-placed Schalke needing a late comeback to snatch a point in a 2-2 draw at top-four rivals Eintracht Frankfurt. Borussia Dortmund moved up to third, two points behind Schalke, as they hit back to win 2-1 at home to Hoffenheim in the late kick-off.