- Diego Costa breaks the deadlock after 75 minutes.
- Ninth straight victory sees Chelsea replace Arsenal at the top of the Premier League.
- West Brom winless run at Stamford Bridge in the league, dating back to 1978, continues.
So a ninth straight win sees Chelsea top the table again with two games to go until Christmas. The football doesn't end there however with Manchester United taking on Tottenham before Liverpool host West Ham. You can follow all the action from Old Trafford here. Goodbye for now.
This is what victory means for the Premier League table, with three games remaining this weekend.
Full time: Chelsea 1-0 West Brom
Chelsea return to the Premier League summit after Diego Costa scores his 12th top flight goal of the campaign. West Brom fought hard but a Gareth McAuley mistake let them down and ends a five match unbeaten run. Antonio Conte is delighted, as is a relieved home support.
Four added minutes at Stamford Bridge. Can West Brom find an equaliser?
Entering the closing minutes at Stamford Bridge where it looks like West Brom have run out of puff somewhat after holding Chelsea at bay for so long. Chasing the game does not suit them and the hosts look comfortable.
Craig Dawson takes aim with a dipping volley but it flies over the crossbar. Courtois needn't worry about those. Chelsea look totally unflustered since taking the lead.
Diego Costa puts Chelsea ahead with a fine finish on 75 minutes.
Goal: Chelsea 1-0 West Brom (Diego Costa)
One mistake and Chelsea have the breakthrough. Gareth McAuley fails to deal with a routine miss-placed pass and is disposed by Costa. The Spaniard holds off the West Brom defender before smashing the ball beyond Foster into the top corner. Relief for Antonio Conte.
Thibaut Courtois has been the busier of the two goalkeepers at Stamford Bridge.
Change of system from Chelsea. Will it have the desired effect?
David Luiz has taken a blow to the head it seems and is receiving treatment. Looks like he'll be ok to continue. Not been his more assuring display since he returned to west London, it must be said.
West Brom haven't given up hope of taking all three points this afternoon and they almost hit the front when Morrison crosses from the left and it takes a despairing block from Cahill to prevent Rondon from finding the net.
Now Cahill intervenes again as Fletcher closes in eight yards out. Chelsea on the ropes now.
Dawson escapes being dismissed as Mike Dean keeps his cards in his pocket. David Luiz tests Foster with a daisy-cutter, which the 'keeper touches behind but without conceding a corner - much to the consternation of Chelsea's support who are growing increasingly frustrated.
Darren Fletcher has been key to West Brom's resilience at Stamford Bridge.
West Brom have not been without ambition this afternoon and they threaten again when Brunt crosses and Courtois is forced to come out and claim the ball ahead of Dawson. Chelsea having things far from their own way.
And now Craig Dawson is cautioned for a foul on Costa. He will miss the game with Swansea in mid-week after receiving his fifth booking of the season.
Yellow card for N'Golo Kante as he takes down Craig Dawson as West Brom look to break. Chelsea remain frustrated by Willian is warming up at the start of the second half. His introduction can't be far away.
Players out for the second half at Stamford Bridge where we're back underway. Can Chelsea break through this West Brom rearguard?
Antonio Conte has cut a dejected figure in the first half as Chelsea chase a ninth straight win.
Half time: Chelsea 0-0 West Bromwich Albion
Good work from West Brom in this first half and they have made Chelsea look distinctly ordinary so far. Just one shot in target in the opening 45 minutes and the Baggies have even threatened themselves.
With a huge number of fixtures to come during the festival period let's hope this slow start isn't a sign of things to come. Not the most thrilling of matches so far at Stamford Bridge and everyone needs a bit of waking up.
N'Golo Kante shoots goalwards and is deflects agonisingly wide of Foster's goal. Better from Chelsea, who have not really woken up this morning.
Best chance of the game and it comes for West Brom again. Salomon Rondon pickpockets David Luiz and takes on Azpilicueta. He drives into the box and shoots left footed, across Courtois but wide of goal. Luiz has looked much like his former self at time this afternoon.
Chris Brunt with the best chance of the game as he shoots across Courtois but wide of the Chelsea goal. Now the Northern Ireland international became the first person in Mike Dean's book after he takes down Diego Costa. The free-kick comes to nothing however.