Erling Haaland fired Manchester City to the top of the Premier League by beating West Ham 3-0, while Liverpool continued their upturn with a 2-1 win at nine-man Tottenham on Saturday.
Arsenal can retake top spot for Christmas when they visit Everton later, but City ramped up the pressure on the Gunners with a seventh consecutive win in all competitions.
The Hammers feared a rout when Haaland smashed home after just five minutes.
Haaland turned provider for City's second just before halftime as Tijjani Reijnders scored his first goal at the Etihad.
And he netted his 38th goal of the season already for club and country when the ball broke his way 21 minutes from time to move City one point ahead of Arsenal.
Yet, Pep Guardiola was still far from satisfied as he demanded improvements if City are to win a seventh Premier League title under his tenure.
"I want to be honest. I said to the players, 'Merry Christmas everyone but it will not be enough if we don't improve'."
ISAK INJURED
Liverpool extended their unbeaten run to six games after they survived a nervy finale to inflict a miserable Christmas on Spurs boss Thomas Frank.
Xavi Simons' dangerous lunge on Dutch international teammate Virgil van Dijk on 33 minutes left the home side with a mountain to climb.
Despite the absence of Mohamed Salah at the Africa Cup of Nations, Alexander Isak again started on the bench.
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Arne Slot introduced the most expensive Premier League player of all time at the break.
The Swede netted just his third goal since joining Liverpool for £125 million in September but suffered another injury setback in the process and had to be replaced.
Hugo Ekitike headed in his fifth goal in three league games to double Liverpool's lead.
But Slot's men still wobbled in the closing stages once Richarlison pulled a goal back.
A fifth defeat in nine home league games this season intensified the pressure on Frank and the Dane was not helped by his captain Cristian Romero, who got himself needlessly sent off in stoppage time.
Liverpool climb up to fifth, while Spurs are rooted down in 13th.
Chelsea remain above the Reds in fourth on goal difference as a second-half fightback rescued manager Enzo Maresca from more speculation over his future.
The Italian claimed after last weekend's win over Everton that he and his players had not received enough support during a difficult run of results.
Maresca was then linked with being Guardiola's successor at City in recent days.
Chelsea have won just once in their last five league games to see ambitions of a title challenge wilt.
But it could have been even worse for Maresca as Nick Woltemade's double put Newcastle 2-0 up in a dominant first half from the Magpies.
A brilliant Reece James free-kick brought the Blues back into the game before Joao Pedro pounced on an error from Malick Thiaw to equalise.
Newcastle felt aggrieved as two late appeals for penalties and for James to be sent off were dismissed to leave Eddie Howe's men languishing in 11th.
Wolves remain without a league win this season and on course to enter the record books as the worst side in Premier League history.
Keane Lewis-Potter scored both goals as Brentford won 2-0 at Molineux to move 10 points clear of the relegation zone.
Burnley ended their seven-game losing streak as Armando Broja's 90th-minute goal snatched a 1-1 draw at Bournemouth.
Sunderland edged up to sixth after a 0-0 draw at Brighton.