Dan Gosling's late strike earned AFC Bournemouth a 1-0 victory over Chelsea at Stamford Bridge.
Aaron Ramsdale was out of his goal quickly to deny Mason Mount early in the first half, before Tammy Abraham fired his effort into the side-netting.
Emerson spurned a great chance to put Chelsea ahead after the break, heading Cesar Azpilicueta's cross straight at Ramsdale.
With six minutes remaining, Gosling put the Cherries ahead when he looped the ball over Kepa Arrizabalaga, for a goal that was initially flagged for offside but was allowed to stand following a VAR review.
A second successive loss leaves Chelsea in fourth on 29 points, while AFC Bournemouth, who had lost their previous five matches, are up to 14th with 19 points.
See: Chelsea report | AFC Bournemouth report
Next fixtures
Chelsea: 22 Dec v Spurs (A)
AFC Bournemouth: 21 Dec v Burnley (H)
Referee: Graham Scott. Assistants: Neil Davies, Derek Eaton. Fourth official: Darren Bond. VAR: Simon Hooper. Assistant VAR: Dan Robathan
