Chelsea's winning streak came to an end on Wednesday night thanks to a dominant and ruthless performance from Tottenham Hotspur at White Hart Lane.
The title race is back on, and the composure of Mauricio Pochettino's team would suggest they stand as good a chance as any of catching Antonio Conte's Blues.
Arsenal's unlikely comeback at AFC Bournemouth was not enough to prevent them slipping out of the top four, while Manchester United's sixth successive league, defeating 10-man West Ham United, brought them to within two points of Arsene Wenger's team.
All of a sudden, the top end of the Premier League is beginning to look very interesting.
1) Spurs possess the bravery needed to push Chelsea all the way
Tottenham were incredibly assured throughout the 90 minutes, and their overall territorial domination suggests they are mature enough – and brave enough – to fight for the Premier League title.
They held a very high line during the first 60 minutes in order to compress the area in which Chelsea could counter.
Spurs' high back three of Eric Dier, Toby Alderweireld and Jan Vertonghen sat on the halfway line to force Eden Hazard and Pedro into harmless positions, leaving Mousa Dembele and Victor Wanyama alone to easily shepherd N'Golo Kante and Nemanja Matic out of the game.
There was simply no way for these two to outmanoeuvre the Spurs midfield and make space for the counter.
As the game wore on, these expansive tactics became even bolder. Many teams would have dropped deep after scoring a second goal, but instead Spurs held their ground and, remarkably, Pochettino instructed Dele Alli to play alongside Harry Kane as a centre forward.
His threat on the counter made Chelsea anxious, severely limiting their commitment to attack.
Such an aggressive territorial victory ultimately forced both Spurs goals. Christian Eriksen was left free to cross for Alli because, on two occasions, Chelsea's weary players began to retreat.
2) Allardyce trying to withdraw some of Palace's width. And it isn't working!
For the second successive game Crystal Palace boss Sam Allardyce has played Yohan Cabaye as the most advanced of his central midfield three, presumably in order to add composure to his team's attacks.
Inevitably, this has led to Palace using the centre of the pitch more frequently than they did under Alan Pardew.
Andros Townsend and Wilfried Zaha have been used as inverted wingers in all three of Big Sam's games to date (they regularly swapped positions under Pardew), which only further ensures that things go through the centre.
Against Swansea City, it did not work at all.
Pace on the flanks is Palace's key strength and so the decision was a rather strange one. Swansea easily stunted their path to goal thanks to their narrow formation, leaving Allardyce's side looking disjointed and directionless.
3) Arsenal have the strength in depth they've needed for years – but it's too late
Arsene Wenger finally made the signings over the summer needed for Arsenal to rotate the squad enough to keep legs – and minds – fresh for a long and jading season.
Not only has Shkodran Mustafi proved to be the perfect no-nonsense partner for Laurent Koscielny, but Granit Xhaka – and now Lucas Perez – have given Wenger new options when times get tough.
Furthermore, centre-forward Olivier Giroud only goes through bursts of good form, and so Alexis Sanchez's emergence in this position has kept the Frenchman fresh.
Perez's brilliant second goal at Dean Court was a watershed moment for the club; the eventual comeback showed that this is a more talented and stronger side than they have been for years.
Sadly, it is simply too little too late.
The strength of Antonio Conte's Chelsea, plus the introduction of Pep Guardiola and Jurgen Klopp to the Premier League, means Wenger stands little chance of lifting the league title again.
Best of the Week – Didier Ndong
The 22-year-old Gabonese midfielder has had a difficult time so far as a Sunderland player, but he was instrumental in the 2-2 draw with Liverpool on Monday.
He made six tackles and six interceptions (his best tally of the season to date), helping keep Jurgen Klopp's forwards quiet with an aggressive display from defensive midfield.
Unfortunately, Davis Moyes will now lose Ndong to the African Cup of Nations in the player's homeland meaning the Black Cats will need to find an act replacement swiftly if they are to continue their climb out of the bottom three.
Worst of the Week – Mike Dean
Slaven Bilic's West Ham matched Manchester United during the first 15 minutes at the London Stadium, playing with the congested midfield and focused pressing reminiscent of their form against the big teams last season.
We were on for an exciting match until Mike Dean made yet another inexcusable error and handed Man United a major advantage.
Sofiane Feghouli's tackle on Phil Jones was fair. The 50-50 challenge should not have been penalised either way, and if not for Jones' reaction, it would have been 11 v 11 for the duration.
This comes, however, after Cheikhou Kouyate was lucky to escape a major booking for his over-the-top challenge on Henrikh Mkhitaryan.
The Hammers deserve credit for holding out for so long with a striker-less formation, but ultimately the power of Paul Pogba and Zlatan Ibrahimovic wore them down, even if the second goal was offside.
A poor all-round performance from Dean.
