Chelsea suffered a frustrating derby defeat as Tottenham secured a 2-0 victory at Stamford Bridge, ending a long hoodoo that had seen them win there only once in 36 years.
The Blues matched a confident and much-improved Tottenham side into the second half, but the match unravelled with 15 minutes remaining when Mike Penders, making his full Premier League debut in place of the injured Emi Martinez, punched the ball into his own net.
Two minutes later, Cole Palmer received a second yellow card for a bad challenge on Conor Gallagher, before Mathys Tel fired home from range to double Tottenham's lead and send home fans heading for the exits.
Disappointing Return to Form
The result was a major setback for Xabi Alonso's side, who had appeared to turn a corner with a professional 2-0 win at Everton in their previous outing, but have now shown themselves to be just as unpredictable as ever.
Standard Sport's Arthur Ferridge was at Stamford Bridge to rate the Chelsea team's performances.
Player Ratings
Mike Penders 3: Was not quite as confident or commanding in the box as Alonso might have liked and looked distinctly nervous. Made a smart save to deny Omar Marmoush a big chance before the break. Scored an own goal in the second half by punching the ball into his own net.
Levi Colwill 6: Kept Marmoush quiet for long stretches. Played a superb ball over the top to put Pedro Neto in behind in the second half.
Maxence Lacroix 6: Composed in defence and impressive in the air. Threatened with a couple of marauding runs forward. Generally did not put a foot wrong.
Josh Acheampong 5: Struggled to contain Tel, who beat him far too easily for the second goal, and was caught out of position after some forward runs. Did well with the ball at his feet.
Pedro Neto 7: Carried his momentum from the brace at Everton. Battled well to set Palmer up for a first-half chance and put in a great defensive shift throughout the evening. Drew a save from Antonin Kinsky after the break.
Moises Caicedo 6: His usual imperious self in midfield. A composed display, no-nonsense defensively, but he wasn't helped by his team-mates.
Jordan Henderson 6: Led the press with energy unbecoming of his not inconsiderable years. Tested Kinsky with a smart shot in the first half and created well in the second.
Jorrel Hato 6: Did not quite appear to be on the same page as some of his defensive partners and at times left them frustrated with miscues. Was largely preoccupied by Mohammed Kudus, who he contained effectively. Replaced just after the hour mark, before Chelsea's implosion.
Geovany Quenda 6: Had massive shoes to fill, replacing the injured Joao Pedro, and lost possession with his first touch. Wasn't overly threatening going forward, but put a good shift in before being replaced.
Cole Palmer 2: Threatened to score with the first proper chance of the game, but on the whole, much too quiet throughout. Until, that is, he was shown a second yellow card for a bad foul on Gallagher.
Morgan Rogers 3: Struggled to fill the shoes of Joao Pedro as he lined up as an out-and-out striker. Was peripheral for much of the affair. Booked late on for a needless, frustrated foul on Gallagher.
Substitutes and Aftermath
Marco Palestra (Hato '65) 4: Failed to affect a turnaround for Chelsea.
Estevao (Quenda '71) 5: Shot into the side netting immediately after his introduction. Did not have much to do as Chelsea collapsed.
Danny Welbeck (Neto '90) N/A: Not used: Sharman-Lowe, Fofana, Barco, Gusto, Nicoll-Jazuli, Lavia.