Manchester City, Arsenal and Liverpool remained in a three-way tie for the lead after 10 matches as Jose Mourinho endured another day of ignominy.
We take a look at the things we learned from the Premier League this weekend:
1. City slickers
A Sergio Aguero double helped Manchester City end the longest winless run of Pep Guardiola's managerial career in emphatic fashion.
A 4-0 victory at West Brom saw City win for the first time in seven matches. Guardiola said: "I was very pleased. What most pleased me? Three points.
"After six times without winning, we needed points for the health."
2. Black Cats' luck falters again
Sunderland tied City's unwanted Premier League record - two points from the first 10 games which City endured in 1995-96 - in losing 4-1 at home to Arsenal, increasing the pressure on manager David Moyes.
The former Everton and Manchester United boss remained defiant, saying: "I have been not quite in this position before, but I am experienced, lots of games in the Premier League. I'll keep doing what I do."
3. Mourinho moved to the stands
Jose Mourinho avoided explaining his apparent dismissal after Manchester United's goalless draw with Burnley.
Mourinho had been furious when referee Mark Clattenburg turned down a first-half penalty appeal and that may have accounted for his second-half place in the stands.
And his assistant Rui Faria offered a sarcastic riposte on the decision to send off Ander Herrera.
Mourinho has until 6pm on Monday to respond to a charge for commenting on referee Anthony Taylor's appointment for the clash at Liverpool and could face further Football Association disciplinary action.
4. Another Hammer blow inflicted by Romelu Lukaku
Belgium striker Romelu Lukaku has scored nine goals in nine games against West Ham, netting in Sunday's 2-0 win for Everton which saw the Toffees win for the first time in five Premier League games.
The defeat completed a challenging week for the Hammers, who on Wednesday were impressive in defeating Chelsea in the EFL Cup. That match was overshadowed by crowd trouble at the former Olympic Stadium.
5. Another Terry saga looming?
John Terry has signed one-year contract extensions in each of the last three seasons, but now it appears he is no longer indispensable for the Blues.
After a shaky display in his first match for more than six weeks in the EFL Cup loss at West Ham, Terry returned to the substitutes' bench for a third successive Premier League game.
Chelsea again kept a clean sheet, their fourth in a row in the league, in Sunday's 2-0 win at Southampton.
Terry is free to talk to foreign clubs in the new year, so an exit could be closer than ever for the man who made his first-team debut 18 years ago this month.