Fulham shocked Arsenal with the Cottagers coming from behind to win 2-1, a result which denied Arsenal the chance to reclaim top spot.
It looked like it was going to be Arsenal's day after Bukayo Saka put them ahead after five minutes but Marco Silva's men rallied through Raul Jimenez and Bobby De Cordova-Reid to claim all three points and deny the Gunners the chance to be top at the start of 2024.
The victory eased some pressure on Marco Silva, whose side ended a run of three straight defeats.
The Gunners landed the first blow when Kai Havertz drove forward from midfield and picked out Gabriel Martinelli. His shot was parried by Bernd Leno into the path of Saka who tapped home to make it 1-0.
Fulham had the chance to draw level after 14 minutes when Willian found the overlapping Antonee Robinson, who delivered a perfect cutback to Jimenez but the Mexican international's shot was comfortably saved by David Raya.
Jimenez returned to the side after he served a three-game suspension after his sending off during Fulham's 3-0 defeat at Newcastle and he looked eager to impress.
Willian's quality shone through against his former side and after his deflected shot won a corner he produced a deft chip to partner Jimenez, who fired over.
And the home side's persistence paid off with the equaliser in the 29th minute.
Willian wreaked havoc down the left and played in captain Tom Cairney, whose whipped cross found Jimenez and he produced a neat first-time finish to claim his fifth goal of the season.
The Cottagers completed the turnaround after 59 minutes as Willian sent a corner deep into the box and after Joao Palhinha's header deflected off Declan Rice the ball bobbled into the path of De Cordova-Reid, who poked home.
A well-worked move saw Saka sky a volley from six yards out as it started to appear it was not going to be Arsenal's day.
Jimenez beat William Saliba to a loose ball before he found Cairney but his long-range strike was magnificently stopped by Raya.
The Cottagers almost extended their advantage in the 88th minute when Takehiro Tomiyasu cynically fouled Harry Wilson and was fortunate to only be shown a yellow card by referee Josh Smith.
Andreas Pereira then saw his dipped effort rebound off Raya's crossbar before the hosts successfully defended a barrage of Arsenal corners during five added minutes to claim the win.
