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Chelsea's disastrous season got even worse as substitute Glenn Murray headed Bournemouth to a 1-0 victory at Stamford Bridge on Saturday evening.
Murray struck eight minutes from time as the reigning champions lost their fourth Barclays Premier League match in their last seven outings at home.
The result leaves Jose Mourinho's side just two points above the drop zone after their eighth league defeat of the season, while Bournemouth climb out of the bottom three at the expense of Sunderland.
There was no place in the starting line-up for Diego Costa as the outspoken Spanish striker was forced to settle for a seat on the bench.
Eddie Howe's side, buoyed by the manner of their comeback in the 3-3 draw against Everton last weekend, looked very lively from the first whistle, with Blues goalkeeper Thibaut Courtois forced into two crucial saves in side the opening quarter of an hour as the Cherries threatened to take control.
First, Eden Hazard was robbed of possession inside his own half. The ball was fed through to Junior Stanislas, but he was unable to capitalise despite having just the goalkeeper to beat.
Shortly afterwards, Courtois was forced into a diving save to deny Joshua King.
But Chelsea slowly got themselves back into the game and Cherries goalkeeper Artur Boruc was called into action on 35 minutes to keep out a stinging Eden Hazard effort for the edge of the penalty area.
The former Celtic goalkeeper was called into action gain four minutes before the break as he produced a superb diving save to keep out Pedro's curling effort.
It remained goalless as the half-time whistle blew, with Bournemouth proving more than a match for the reigning Premier League champions in the opening 45 minutes.
Blues fans had been singing "We want our Costa back" as the striker warmed-up late in the first half and, although it was unclear whether it was aimed at the Spaniard or his manager, the message seemed to have some effect as he was introduced in place of Oscar after the break.
Matt Ritchie was narrowly off target with a speculative effort from distance as Bournemouth continued to cause trouble for the home side.
Nemanja Matic headed just over at the other end following a prolonged spell of Chelsea pressure, before Boruc tipped a dangerous-looking Branislav Ivanovic cross-shot out for a corner.
Chelsea began to dominate as the second half continued and Bournemouth were forced to defend in depth for long periods.
Kevin Francis did brilliantly to prevent Costa putting the home side ahead on 76 minutes as he denied the striker the chance to get his shot away with the goal gaping.
The Cherries were rewarded for their defensive efforts when former Crystal Palace striker Murray put them in front with eight minutes remaining, heading home after Chelsea had failed to deal with a rare corner, although he looked suspiciously offside.
The Blues poured forward in search of an equaliser but were unable to find a way through as Eddie Howe's side held on for a famous victory, with Republic of Ireland midfielder Harry Arter even coming close to doubling their advantage in stoppage time.