Liam Rosenior's winning run to begin his reign at Chelsea came to an abrupt end as the Blues threw away a two-goal lead against Leeds United at Stamford Bridge.
The hosts had a two-goal cushion thanks to efforts either side of half-time from Joao Pedro and Cole Palmer.
But they conspired to throw it away, first by gifting Leeds a route back into the match when Moises Caicedo brought down Jayden Bogle to allow Lukas Nmecha to convert from the spot.
The equaliser came via calamitous defending, with Josh Acheampong, Malo Gusto and Robert Sanchez failing to clear a ball over the top, allowing Noah Okafor to poke home an equaliser.
Chelsea, who have won four Premier League games under Rosenior, could though end the night in the top four if Manchester United do not win at West Ham in the later kick-off.
Leeds leapfrog Tottenham into 15th place, six points above the relegation zone.