5 things we learned from the Premier League weekend
Manchester City made it six wins from six Premier League matches while Manchester United returned to form as they put four past champions Leicester.
Arsenal turned on the style to beat Chelsea 3-0 while West Ham's slump at the London Stadium continued as Southampton ran out 3-0 winners.
Here, Press Association Sport looks at some of the key talking points from the latest Premier League fixtures.
1. Super six for Pep's City slickers
Whatever anyone may have to say about Pep Guardiola's squad management, the results speak for themselves as City won 3-1 at Swansea to maintain their 100 per cent Premier League start. It was a 10th straight win in all competitions and while sterner tests are ahead with a trip to second-place Tottenham before the international break and a European tie away at Barcelona after it, at the moment, City look to mean business on all fronts. Guardiola has laid his marker down. Now it is up to his rival Premier League bosses to provide their own answer.
2. United win again, and with Rooney on the bench
For United manager Jose Mourinho, that was simple. Drop captain Wayne Rooney and give defending champions Leicester the runaround at Old Trafford. Following three straight defeats, the "Einsteins" may have been ready to pen Mourinho's impending downfall, but you are only ever as good as your last result. Okay, so beating Northampton away in the EFL Cup and seeing off a team still struggling for its own identity this season does not make United world-beaters, but it is as good a place as any to make a start. Next up at Old Trafford, Ukrainian outfit Zorya Luhansk in the Europa League.
3. Gunners fire to give Chelsea the blues
It has been a long time coming, but Arsenal finally produced the required display to see off Chelsea - and with some style as Alexis Sanchez and Mesut Ozil helped put the Gunners 3-0 ahead before half-time. It could, and should, have been more, a lot more. But the morale-boosting victory will at least serve as a timely reminder to those who think the title race is all about Manchester - and possibly the white half of north London or perhaps the Merseyside Reds - just what Arsene Wenger's side are capable of when they get things right.
4. Black Cats bad luck goes on
They say 2-0 is the most dangerous scoreline in football, well it is if you are Sunderland anyway. A double from evergreen Jermain Defoe had David Moyes' men in complete control and seemingly set for a much-needed first home Premier League win of the season. But, so we are told, when you are down at the bottom, you never seem to get the rub of the green, or be able to stop Christian Benteke from heading in a dramatic stoppage-time winner anyway. The answer is easy, according to Moyes: ''The team is all in it together, but we need to get a better team, it's as simple as that. We need to get a team which can give us results.''
5. West Ham need some home comforts
When Irons fans said goodbye to The Boleyn Ground at Upton Park last season, everything was supposed to turn out claret and blue when Slaven Bilic's men settled into their impressive new home at the London Stadium. However, whether it is a supposed lack of atmosphere, the away team no longer being fazed by their surroundings as the bubbles blow out onto the immaculate pitch, the Hammers' team this season just not being able to click or perhaps a bit of it all, something is missing. Hopes had been lifted by a (late, late) EFL Cup win over Accrington Stanley, but the way in which Southampton condemned West Ham to a fourth successive Premier League defeat with only one shot on target from the "home team" tells its own story.