What to watch in the leading soccer leagues in Europe this weekend:
It's Manchester against London in the Premier League on Sunday.
Manchester City, the league's last unbeaten, sits five points clear of neighbor United ahead of the visit of Arsenal. And the goals are flowing from Pep Guardiola's side, with 35 in the opening 10 games — 12 more than United.
Jose Mourinho takes United to former club Chelsea amid criticism of his team's recent performances.
"Similar performances for some clubs are magic, are examples of brilliant tactics and amazing attitude of the players," Mourinho said, "and for other teams the same kind of performance becomes conservative, negative, so many adjectives."
But Chelsea counterpart Antonio Conte is in a more fragile position after the Premier League champions lost to Roma 3-0 in the Champions League.
Tottenham, which is between United and Chelsea in third, returns to domestic action after humbling Real Madrid 3-1 to qualify for the Champions League knockout phase. Tottenham hosts bottom-place Crystal Palace after losing its last two domestic games in the League Cup and Premier League.
The leading clubs resume their Spanish title challenges after a tricky week in the Champions League.
Barcelona takes on fifth-place Sevilla holding a four-point lead over Valencia at the summit. But the Catalan side showed signs of weariness when it drew 0-0 at Olympiakos in the Champions League on Tuesday.
Madrid rivals Real and Atletico are already eight points behind Barcelona after 10 matches.
Real Madrid, which hosts Las Palmas on Sunday, is reeling from away losses in the league to Girona and to Tottenham in the Champions league.
Atletico Madrid, whose chances of advancing in the Champions League are virtually over after drawing with Qarabag, is at Deportivo La Coruna on Saturday. Atletico has been struggling recently, with only one victory in eight matches. Valencia, which has won six games in a row in the league, hosts Leganes on Saturday.
It's first vs. second and third vs. fourth in Germany on Saturday.
With only one win in six games in all competitions, Borussia Dortmund is low on confidence. But it's still only three points behind Bayern Munich going into the meeting with the Bundesliga leader on Saturday.
"The mood in the camp isn't quite what it was at the start," Dortmund midfielder Christian Pulisic said, reflecting on how 19 points were taken from a possible 21 in the opening weeks of the season.
Dortmund's Champions League hopes have also gone miserably, collecting only two points from four games. RB Leipzig is also third in its group but with a far more realistic shot at making the last 16 despite losing to Porto on Wednesday.
Leipzig, which is a point behind Dortmund in third place in the Bundesliga, hosts fourth-place Hannover on Saturday.
Vincenzo Montella's future as AC Milan coach is under scrutiny ahead of their Serie A game at Sassuolo on Sunday.
Despite an offseason of heavy spending, Milan has won only one of its last six matches and was thoroughly outplayed in a 2-0 loss to Juventus last weekend.
Gennaro Gattuso, Milan's youth squad coach and former gritty midfielder, is being mentioned as a possible replacement for Montella.
Serie A leader Napoli will need to find a solution for a long-term injury to left back Faouzi Ghoulam before a visit to Chievo Verona.
Second-place Inter Milan hosts Torino and six-time defending champion Juventus welcomes bottom side Benevento.
Benevento has lost all of its matches and is one more loss away from matching Manchester United's streak of 12 to open the 1930 season as the worst ever start in Europe's five major leagues.
Unbeaten leader Paris Saint-Germain faces a testing trip on Saturday to Angers, which is one of the league's toughest sides to beat at home.
Second-place Monaco is four points behind and, should PSG drop points, is poised to take advantage with a home game against mid-table Guingamp. Monaco hopes to welcome back top scorer Radamel Falcao after two games out with muscle fatigue.
Nice challenged for the title for long spells last season, but is now looking just over its shoulder at the relegation zone. Lucien Favre's side has lost seven times already and is in 17th place ahead of a must-win home game against Dijon on Sunday. More dropped points could jeopardize Favre's position.
Lyon seems to have finally found consistency at both ends of the field and, with forward Nabil Fekir in superb form, can feel optimistic about pushing for a top-three finish. But so can Marseille, which is unbeaten in six league games and sits one point behind in fourth.
Both play on Sunday, with Marseille at home to Caen and Lyon away at bitter local rival Saint-Etienne.
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