Roberto Di Matteo made the decision to rest some key players, with one eye on Tuesday's crucial Champions League tie against Juventus.
Among those who did not start were Ashley Cole, Branislav Ivanovic, Juan Mata, Ramires and Oscar, the last three of whom came on as substitutes in an attempt to salvage some points late in the game.
It was a match in which Chelsea controlled much of the possession and had most of the chances, but ultimately the Blues were not able to produce that end product needed to secure a win, or even a draw.
Read on for the Chelsea player ratings, each one out of 10.
Chelsea's stand-in captain was not to blame for either of the Baggies' two goals and was hardly tested apart from them.
However, Cech may be disappointed with the second goal, a header between his legs.
Despite some heroic efforts in the dying minutes, the Czech was not able to contribute to an equalizer.
The left-back had a good start, linking up well with Victor Moses and then Eden Hazard, on the left. Bertrand was unlucky not to score early in the first half with a good shot that was saved by the West Brom 'keeper.
However his impact lessened quite a bit in the second half, and he was to blame for some poor marking on the second West Brom goal.
Cahill was the stronger of the two central defenders, but unfortunately that is not saying much.
The England player was troubled by Shane Long all match, and ultimately Long came out on top.
David Luiz has had better days in a Chelsea shirt.
The Brazilian lost his man for the first West Brom goal, allowing Shane Long to head in.
He often looked suspect in possession, losing the ball a few times.
Azpilicueta looked lively throughout, getting high up the field and hitting in some good crosses.
One such cross was the assist for Eden Hazard's headed equalizer.
A good performance, but probably not enough to convince Di Matteo to select him over Branislav Ivanovic against Juventus.
Romeu will not get many better chances to prove to Di Matteo that he should hold a regular starting place in the Chelsea midfield, and he is likely to stay behind Ramires, Mikel and Lampard in the pecking order after this performance.
The Spaniard was caught ball-watching for the first goal, allowing James Morrison to put a cross in. He was also guilty of a few stray passes and was taken off after an hour.
Mikel's job is to protect the defense and start attacking plays from deep in the field.
However, the Nigerian was mostly anonymous in both aspects on Saturday.
Moses was the best player for much of the first half, working well with Bertrand to create chances along the left.
He still threatened after he was switched with Hazard, but ultimately could not make a difference to the result.
Hazard had a tough start, but threatened after he moved to the left.
The Belgian contributed Chelsea's only goal with a headed effort.
Had Sturridge played the whole game in the central striker position, how different might the result have been?
The England striker was lively throughout, with good movement but no end product.
He had two good chances to up his rating and make the difference for Chelsea.
The first was a one-on-one that was well-saved by Boaz Myhill. The second was a shot in the 86th minute that would have served better as a cross to Mata, who was waiting to tap in at the far post.
Torres failed to make any dangerous runs and hardly touched the ball.
The Spaniard was rightly taken off after an hour.
Juan Mata and Oscar made a huge difference when they came on after 60 minutes. Both players provided Sturridge with opportunities to bring the Blues level.
However, neither player was able to provide the goals or assists that were needed for Chelsea to get something out of this match.
Ramires was added with 10 minutes remaining, but had little time to make an impact.